diff --git a/specification/containerregistry/resource-manager/Microsoft.ContainerRegistry/stable/2017-10-01/containerregistry.json b/specification/containerregistry/resource-manager/Microsoft.ContainerRegistry/stable/2017-10-01/containerregistry.json
index 93b2ae0f7b12..3bfc07179b16 100644
--- a/specification/containerregistry/resource-manager/Microsoft.ContainerRegistry/stable/2017-10-01/containerregistry.json
+++ b/specification/containerregistry/resource-manager/Microsoft.ContainerRegistry/stable/2017-10-01/containerregistry.json
@@ -1201,15 +1201,35 @@
           "type": "string"
         },
         "registryUri": {
-          "description": "The address of the source registry.",
+          "description": "The address of the source registry (e.g. 'mcr.microsoft.com').",
           "type": "string"
         },
+        "credentials": {
+          "$ref": "#/definitions/ImportSourceCredentials",
+          "description": "Credentials used when importing from a registry uri."
+        },
         "sourceImage": {
           "description": "Repository name of the source image.\r\nSpecify an image by repository ('hello-world'). This will use the 'latest' tag.\r\nSpecify an image by tag ('hello-world:latest').\r\nSpecify an image by sha256-based manifest digest ('hello-world@sha256:abc123').",
           "type": "string"
         }
       }
     },
+    "ImportSourceCredentials": {
+      "required": [
+        "password"
+      ],
+      "type": "object",
+      "properties": {
+        "username": {
+          "description": "The username to authenticate with the source registry.",
+          "type": "string"
+        },
+        "password": {
+          "description": "The password used to authenticate with the source registry.",
+          "type": "string"
+        }
+      }
+    },
     "RegistryNameCheckRequest": {
       "description": "A request to check whether a container registry name is available.",
       "required": [