diff --git a/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/CommonDefinitions.json b/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/CommonDefinitions.json
index 49ade60347df..50937ab0891c 100644
--- a/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/CommonDefinitions.json
+++ b/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/CommonDefinitions.json
@@ -507,6 +507,53 @@
         }
       }
     },
+    "AzureStorageInfoValue": {
+      "description": "Azure Files or Blob Storage access information value for dictionary storage.",
+      "type": "object",
+      "properties": {
+        "type": {
+          "description": "Type of storage.",
+          "enum": [
+            "AzureFiles",
+            "AzureBlob"
+          ],
+          "type": "string",
+          "x-ms-enum": {
+            "name": "AzureStorageType",
+            "modelAsString": false
+          }
+        },
+        "accountName": {
+          "description": "Name of the storage account.",
+          "type": "string"
+        },
+        "shareName": {
+          "description": "Name of the file share (container name, for Blob storage).",
+          "type": "string"
+        },
+        "accessKey": {
+          "description": "Access key for the storage account.",
+          "type": "string"
+        },
+        "mountPath": {
+          "description": "Path to mount the storage within the site's runtime environment.",
+          "type": "string"
+        },
+        "state": {
+          "description": "State of the storage account.",
+          "enum": [
+            "Ok",
+            "InvalidCredentials",
+            "InvalidShare"
+          ],
+          "type": "string",
+          "x-ms-enum": {
+            "name": "AzureStorageState",
+            "modelAsString": false
+          }
+        }
+      }
+    },
     "Capability": {
       "description": "Describes the capabilities/features allowed for a specific SKU.",
       "type": "object",
@@ -2127,6 +2174,13 @@
             "$ref": "#/definitions/NameValuePair"
           }
         },
+        "azureStorageAccounts": {
+          "description": "User-provided Azure storage accounts.",
+          "type": "object",
+          "additionalProperties": {
+            "$ref": "#/definitions/AzureStorageInfoValue"
+          }
+        },
         "connectionStrings": {
           "description": "Connection strings.",
           "type": "array",
diff --git a/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/WebApps.json b/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/WebApps.json
index 0ec3d9f459bc..b76a9b8dc718 100644
--- a/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/WebApps.json
+++ b/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/WebApps.json
@@ -911,6 +911,99 @@
         }
       }
     },
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{name}/config/azurestorageaccounts": {
+      "put": {
+        "tags": [
+          "WebApps"
+        ],
+        "summary": "Updates the Azure storage account configurations of an app.",
+        "description": "Updates the Azure storage account configurations of an app.",
+        "operationId": "WebApps_UpdateAzureStorageAccounts",
+        "parameters": [
+          {
+            "$ref": "#/parameters/resourceGroupNameParameter"
+          },
+          {
+            "name": "name",
+            "in": "path",
+            "description": "Name of the app.",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "name": "azureStorageAccounts",
+            "in": "body",
+            "description": "Azure storage accounts of the app.",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/AzureStoragePropertyDictionaryResource"
+            }
+          },
+          {
+            "$ref": "#/parameters/subscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/AzureStoragePropertyDictionaryResource"
+            }
+          },
+          "default": {
+            "description": "App Service error response.",
+            "schema": {
+              "$ref": "./CommonDefinitions.json#/definitions/DefaultErrorResponse"
+            }
+          }
+        }
+      }
+    },
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{name}/config/azurestorageaccounts/list": {
+      "post": {
+        "tags": [
+          "WebApps"
+        ],
+        "summary": "Gets the Azure storage account configurations of an app.",
+        "description": "Gets the Azure storage account configurations of an app.",
+        "operationId": "WebApps_ListAzureStorageAccounts",
+        "parameters": [
+          {
+            "$ref": "#/parameters/resourceGroupNameParameter"
+          },
+          {
+            "name": "name",
+            "in": "path",
+            "description": "Name of the app.",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "$ref": "#/parameters/subscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/AzureStoragePropertyDictionaryResource"
+            }
+          },
+          "default": {
+            "description": "App Service error response.",
+            "schema": {
+              "$ref": "./CommonDefinitions.json#/definitions/DefaultErrorResponse"
+            }
+          }
+        }
+      }
+    },
     "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{name}/config/backup": {
       "put": {
         "tags": [
@@ -7577,6 +7670,113 @@
         }
       }
     },
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{name}/slots/{slot}/config/azurestorageaccounts": {
+      "put": {
+        "tags": [
+          "WebApps"
+        ],
+        "summary": "Updates the Azure storage account configurations of an app.",
+        "description": "Updates the Azure storage account configurations of an app.",
+        "operationId": "WebApps_UpdateAzureStorageAccountsSlot",
+        "parameters": [
+          {
+            "$ref": "#/parameters/resourceGroupNameParameter"
+          },
+          {
+            "name": "name",
+            "in": "path",
+            "description": "Name of the app.",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "name": "azureStorageAccounts",
+            "in": "body",
+            "description": "Azure storage accounts of the app.",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/AzureStoragePropertyDictionaryResource"
+            }
+          },
+          {
+            "name": "slot",
+            "in": "path",
+            "description": "Name of the deployment slot. If a slot is not specified, the API will update the Azure storage account configurations for the production slot.",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "$ref": "#/parameters/subscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/AzureStoragePropertyDictionaryResource"
+            }
+          },
+          "default": {
+            "description": "App Service error response.",
+            "schema": {
+              "$ref": "./CommonDefinitions.json#/definitions/DefaultErrorResponse"
+            }
+          }
+        }
+      }
+    },
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{name}/slots/{slot}/config/azurestorageaccounts/list": {
+      "post": {
+        "tags": [
+          "WebApps"
+        ],
+        "summary": "Gets the Azure storage account configurations of an app.",
+        "description": "Gets the Azure storage account configurations of an app.",
+        "operationId": "WebApps_ListAzureStorageAccountsSlot",
+        "parameters": [
+          {
+            "$ref": "#/parameters/resourceGroupNameParameter"
+          },
+          {
+            "name": "name",
+            "in": "path",
+            "description": "Name of the app.",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "name": "slot",
+            "in": "path",
+            "description": "Name of the deployment slot. If a slot is not specified, the API will update the Azure storage account configurations for the production slot.",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "$ref": "#/parameters/subscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/AzureStoragePropertyDictionaryResource"
+            }
+          },
+          "default": {
+            "description": "App Service error response.",
+            "schema": {
+              "$ref": "./CommonDefinitions.json#/definitions/DefaultErrorResponse"
+            }
+          }
+        }
+      }
+    },
     "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{name}/slots/{slot}/config/backup": {
       "put": {
         "tags": [
@@ -15659,7 +15859,7 @@
               "$ref": "#/definitions/SiteSourceControl"
             }
           },
-	  "default": {
+          "default": {
             "description": "App Service error response.",
             "schema": {
               "$ref": "./CommonDefinitions.json#/definitions/DefaultErrorResponse"
@@ -16817,6 +17017,25 @@
         }
       }
     },
+    "AzureStoragePropertyDictionaryResource": {
+      "description": "AzureStorageInfo dictionary resource.",
+      "type": "object",
+      "allOf": [
+        {
+          "$ref": "./CommonDefinitions.json#/definitions/ProxyOnlyResource"
+        }
+      ],
+      "properties": {
+        "properties": {
+          "description": "Azure storage accounts.",
+          "type": "object",
+          "additionalProperties": {
+            "$ref": "./CommonDefinitions.json#/definitions/AzureStorageInfoValue"
+          },
+          "x-ms-client-flatten": true
+        }
+      }
+    },
     "AzureTableStorageApplicationLogsConfig": {
       "description": "Application logs to Azure table storage configuration.",
       "required": [
@@ -19689,7 +19908,7 @@
       }
     },
     "SlotConfigNames": {
-      "description": "Names for connection strings and application settings to be marked as sticky to the deployment slot and not moved during a swap operation.\nThis is valid for all deployment slots in an app.",
+      "description": "Names for connection strings, application settings, and external Azure storage account configuration\nidentifiers to be marked as sticky to the deployment slot and not moved during a swap operation.\nThis is valid for all deployment slots in an app.",
       "type": "object",
       "properties": {
         "connectionStringNames": {
@@ -19705,6 +19924,13 @@
           "items": {
             "type": "string"
           }
+        },
+        "azureStorageConfigNames": {
+          "description": "List of external Azure storage account identifiers.",
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
         }
       }
     },
@@ -20339,4 +20565,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}