diff --git a/specification/storage/resource-manager/Microsoft.Storage/preview/2018-03-01-preview/storage.json b/specification/storage/resource-manager/Microsoft.Storage/preview/2018-03-01-preview/storage.json
index ad4fcd4389aa..ae5074c69117 100644
--- a/specification/storage/resource-manager/Microsoft.Storage/preview/2018-03-01-preview/storage.json
+++ b/specification/storage/resource-manager/Microsoft.Storage/preview/2018-03-01-preview/storage.json
@@ -741,6 +741,10 @@
             "operation": {
               "description": "Type of operation: get, read, delete, etc.",
               "type": "string"
+            },
+            "description": {
+              "description": "Description of the operation.",
+              "type": "string"
             }
           }
         },
@@ -1989,8 +1993,7 @@
         }
       },
       "required": [
-        "canonicalizedResource",
-        "signedResource"
+        "canonicalizedResource"
       ],
       "description": "The parameters to list service SAS credentials of a speicific resource."
     },
diff --git a/specification/storage/resource-manager/Microsoft.Storage/stable/2018-02-01/storage.json b/specification/storage/resource-manager/Microsoft.Storage/stable/2018-02-01/storage.json
index b74d8644467a..ee943493b118 100644
--- a/specification/storage/resource-manager/Microsoft.Storage/stable/2018-02-01/storage.json
+++ b/specification/storage/resource-manager/Microsoft.Storage/stable/2018-02-01/storage.json
@@ -673,6 +673,10 @@
             "operation": {
               "description": "Type of operation: get, read, delete, etc.",
               "type": "string"
+            },
+            "description": {
+              "description": "Description of the operation.",
+              "type": "string"
             }
           }
         },
@@ -1921,8 +1925,7 @@
         }
       },
       "required": [
-        "canonicalizedResource",
-        "signedResource"
+        "canonicalizedResource"
       ],
       "description": "The parameters to list service SAS credentials of a speicific resource."
     },