diff --git a/examples/internal/clients/abe/api/swagger.yaml b/examples/internal/clients/abe/api/swagger.yaml
index 69280c48d8a..940186a3860 100644
--- a/examples/internal/clients/abe/api/swagger.yaml
+++ b/examples/internal/clients/abe/api/swagger.yaml
@@ -60,7 +60,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/a_bit_of_everything/echo/{value}:
@@ -102,7 +102,7 @@ paths:
           schema: {}
           x-number: 100
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
       externalDocs:
@@ -392,7 +392,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/a_bit_of_everything/params/get/{single_nested.name}:
@@ -686,7 +686,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/a_bit_of_everything/params/post/{string_value}:
@@ -967,7 +967,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/a_bit_of_everything/query/{uuid}:
@@ -1267,7 +1267,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
       security: []
@@ -1424,7 +1424,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/a_bit_of_everything/{single_nested.name}:
@@ -1464,7 +1464,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/a_bit_of_everything/{uuid}:
@@ -1497,7 +1497,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
     put:
@@ -1534,7 +1534,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
     delete:
@@ -1565,7 +1565,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
       security:
@@ -1761,7 +1761,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/{parent=publishers/*}/books:
@@ -1812,7 +1812,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v2/example/a_bit_of_everything/{abe.uuid}:
@@ -1859,7 +1859,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
     patch:
@@ -1905,7 +1905,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v2/example/echo:
@@ -1948,7 +1948,7 @@ paths:
           schema: {}
           x-number: 100
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
       externalDocs:
@@ -1993,7 +1993,7 @@ paths:
           schema: {}
           x-number: 100
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
       externalDocs:
@@ -2023,7 +2023,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v2/example/errorwithdetails:
@@ -2050,7 +2050,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v2/example/overwriteresponsecontenttype:
@@ -2080,7 +2080,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v2/example/postwithemptybody/{name}:
@@ -2118,7 +2118,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v2/example/timeout:
@@ -2145,7 +2145,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v2/example/withbody/{id}:
@@ -2183,7 +2183,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v2/{value}:check:
@@ -2218,7 +2218,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v2a/example/a_bit_of_everything/{abe.uuid}:
@@ -2256,7 +2256,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbNumericEnum"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
 securityDefinitions:
diff --git a/examples/internal/clients/echo/api/swagger.yaml b/examples/internal/clients/echo/api/swagger.yaml
index 2df4be32a99..69fce06d757 100644
--- a/examples/internal/clients/echo/api/swagger.yaml
+++ b/examples/internal/clients/echo/api/swagger.yaml
@@ -29,7 +29,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbSimpleMessage"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/echo/{id}/{num}:
@@ -104,7 +104,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbSimpleMessage"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/echo/{id}/{num}/{lang}:
@@ -178,7 +178,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbSimpleMessage"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/echo1/{id}/{line_num}/{status.note}:
@@ -246,7 +246,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbSimpleMessage"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/echo2/{no.note}:
@@ -316,7 +316,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbSimpleMessage"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/echo_body:
@@ -338,7 +338,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbSimpleMessage"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/echo_delete:
@@ -414,7 +414,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbSimpleMessage"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
 definitions:
diff --git a/examples/internal/clients/responsebody/api/swagger.yaml b/examples/internal/clients/responsebody/api/swagger.yaml
index 9a8fd0ea52a..fe52fd68a84 100644
--- a/examples/internal/clients/responsebody/api/swagger.yaml
+++ b/examples/internal/clients/responsebody/api/swagger.yaml
@@ -27,7 +27,7 @@ paths:
             items:
               $ref: "#/definitions/examplepbRepeatedResponseBodyOutResponse"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /responsebody/stream/{data}:
@@ -53,7 +53,7 @@ paths:
                 $ref: "#/definitions/runtimeStreamError"
             title: "Stream result of examplepbResponseBodyOut"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /responsebody/{data}:
@@ -73,7 +73,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbResponseBodyOutResponse"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /responsestrings/{data}:
@@ -95,7 +95,7 @@ paths:
             items:
               type: "string"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
 definitions:
diff --git a/examples/internal/clients/unannotatedecho/api/swagger.yaml b/examples/internal/clients/unannotatedecho/api/swagger.yaml
index ab5450bab15..2f1b0a565e6 100644
--- a/examples/internal/clients/unannotatedecho/api/swagger.yaml
+++ b/examples/internal/clients/unannotatedecho/api/swagger.yaml
@@ -32,7 +32,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbUnannotatedSimpleMessage"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/echo/{id}/{num}:
@@ -67,7 +67,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbUnannotatedSimpleMessage"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/echo_body:
@@ -89,7 +89,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbUnannotatedSimpleMessage"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
   /v1/example/echo_delete:
@@ -125,7 +125,7 @@ paths:
           schema:
             $ref: "#/definitions/examplepbUnannotatedSimpleMessage"
         default:
-          description: "An unexpected error response"
+          description: "An unexpected error response."
           schema:
             $ref: "#/definitions/runtimeError"
 definitions:
diff --git a/examples/internal/proto/examplepb/a_bit_of_everything.swagger.json b/examples/internal/proto/examplepb/a_bit_of_everything.swagger.json
index bc9f60de209..292069d5760 100644
--- a/examples/internal/proto/examplepb/a_bit_of_everything.swagger.json
+++ b/examples/internal/proto/examplepb/a_bit_of_everything.swagger.json
@@ -56,7 +56,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -117,7 +117,7 @@
             "x-number": 100
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -168,7 +168,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -482,7 +482,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -802,7 +802,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -1111,7 +1111,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -1446,7 +1446,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -1632,7 +1632,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -1688,7 +1688,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -1733,7 +1733,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -1788,7 +1788,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -1843,7 +1843,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2079,7 +2079,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2143,7 +2143,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2207,7 +2207,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2285,7 +2285,7 @@
             "x-number": 100
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2346,7 +2346,7 @@
             "x-number": 100
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2399,7 +2399,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2438,7 +2438,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2477,7 +2477,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2519,7 +2519,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2574,7 +2574,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2613,7 +2613,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2668,7 +2668,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -2719,7 +2719,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
diff --git a/examples/internal/proto/examplepb/echo_service.swagger.json b/examples/internal/proto/examplepb/echo_service.swagger.json
index 43d9b608d56..7ea8bcd9ca1 100644
--- a/examples/internal/proto/examplepb/echo_service.swagger.json
+++ b/examples/internal/proto/examplepb/echo_service.swagger.json
@@ -25,7 +25,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -58,7 +58,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -144,7 +144,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -230,7 +230,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -310,7 +310,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -389,7 +389,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -422,7 +422,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
diff --git a/examples/internal/proto/examplepb/response_body_service.swagger.json b/examples/internal/proto/examplepb/response_body_service.swagger.json
index 1fad10c2042..68f8f8f8551 100644
--- a/examples/internal/proto/examplepb/response_body_service.swagger.json
+++ b/examples/internal/proto/examplepb/response_body_service.swagger.json
@@ -25,7 +25,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -64,7 +64,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -94,7 +94,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -127,7 +127,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
diff --git a/examples/internal/proto/examplepb/stream.swagger.json b/examples/internal/proto/examplepb/stream.swagger.json
index 9b468d5bb9d..6e6b885f005 100644
--- a/examples/internal/proto/examplepb/stream.swagger.json
+++ b/examples/internal/proto/examplepb/stream.swagger.json
@@ -31,7 +31,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -53,7 +53,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -95,7 +95,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
diff --git a/examples/internal/proto/examplepb/swagger_merge.swagger.json b/examples/internal/proto/examplepb/swagger_merge.swagger.json
index 39e37d5330c..4dab52d1a81 100644
--- a/examples/internal/proto/examplepb/swagger_merge.swagger.json
+++ b/examples/internal/proto/examplepb/swagger_merge.swagger.json
@@ -25,7 +25,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -59,7 +59,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -93,7 +93,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -127,7 +127,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -161,7 +161,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -195,7 +195,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
diff --git a/examples/internal/proto/examplepb/unannotated_echo_service.swagger.json b/examples/internal/proto/examplepb/unannotated_echo_service.swagger.json
index 4d383edc489..b99f33485cf 100644
--- a/examples/internal/proto/examplepb/unannotated_echo_service.swagger.json
+++ b/examples/internal/proto/examplepb/unannotated_echo_service.swagger.json
@@ -25,7 +25,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -58,7 +58,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -103,7 +103,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -136,7 +136,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
diff --git a/examples/internal/proto/examplepb/use_go_template.swagger.json b/examples/internal/proto/examplepb/use_go_template.swagger.json
index 81e8c735408..c9a83c09466 100644
--- a/examples/internal/proto/examplepb/use_go_template.swagger.json
+++ b/examples/internal/proto/examplepb/use_go_template.swagger.json
@@ -24,7 +24,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -58,7 +58,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
diff --git a/examples/internal/proto/examplepb/wrappers.swagger.json b/examples/internal/proto/examplepb/wrappers.swagger.json
index 1a360fae45a..297df32c1ac 100644
--- a/examples/internal/proto/examplepb/wrappers.swagger.json
+++ b/examples/internal/proto/examplepb/wrappers.swagger.json
@@ -22,7 +22,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -54,7 +54,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -87,7 +87,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -121,7 +121,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -154,7 +154,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -187,7 +187,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -221,7 +221,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -255,7 +255,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -288,7 +288,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -321,7 +321,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
@@ -355,7 +355,7 @@
             }
           },
           "default": {
-            "description": "An unexpected error response",
+            "description": "An unexpected error response.",
             "schema": {
               "$ref": "#/definitions/runtimeError"
             }
diff --git a/protoc-gen-swagger/genswagger/template.go b/protoc-gen-swagger/genswagger/template.go
index 25fd0caafa8..4e537a5ca93 100644
--- a/protoc-gen-swagger/genswagger/template.go
+++ b/protoc-gen-swagger/genswagger/template.go
@@ -1017,7 +1017,7 @@ func renderServices(services []*descriptor.Service, paths swaggerPathsObject, re
 					if hasErrDef {
 						// https://github.com/OAI/OpenAPI-Specification/blob/3.0.0/versions/2.0.md#responses-object
 						operationObject.Responses["default"] = swaggerResponseObject{
-							Description: "An unexpected error response",
+							Description: "An unexpected error response.",
 							Schema: swaggerSchemaObject{
 								schemaCore: schemaCore{
 									Ref: fmt.Sprintf("#/definitions/%s", errDef),