diff --git a/specification/visualstudio/resource-manager/Microsoft.VisualStudio/preview/2014-04-01-preview/Csm.json b/specification/visualstudio/resource-manager/Microsoft.VisualStudio/preview/2014-04-01-preview/Csm.json
index c5cd03b281d5..b9a74fdbc55b 100644
--- a/specification/visualstudio/resource-manager/Microsoft.VisualStudio/preview/2014-04-01-preview/Csm.json
+++ b/specification/visualstudio/resource-manager/Microsoft.VisualStudio/preview/2014-04-01-preview/Csm.json
@@ -517,6 +517,57 @@
             "$ref": "./examples/GetResource.json"
           }
         }
+      },
+      "patch": {
+        "tags": [
+          "Accounts"
+        ],
+        "summary": "Accounts_Update",
+        "description": "Updates tags for Visual Studio Team Services account resource.",
+        "operationId": "Accounts_Update",
+        "parameters": [
+          {
+            "$ref": "#/parameters/resourceGroupNameParameter"
+          },
+          {
+            "$ref": "#/parameters/subscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          },
+          {
+            "in": "body",
+            "name": "body",
+            "description": "The request data.",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/AccountTagRequest"
+            }
+          },
+          {
+            "in": "path",
+            "name": "resourceName",
+            "description": "Name of the resource.",
+            "required": true,
+            "type": "string"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "The operation succeeded. The Visual Studio Team Services account resource was updated.",
+            "schema": {
+              "$ref": "#/definitions/AccountResource"
+            }
+          },
+          "404": {
+            "description": "The Visual Studio Team Services account does not exist."
+          }
+        },
+        "x-ms-examples": {
+          "Create an account resource": {
+            "$ref": "./examples/UpdateTags.json"
+          }
+        }
       }
     },
     "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/microsoft.visualstudio/account/{rootResourceName}/project": {
@@ -839,6 +890,19 @@
         }
       }
     },
+    "AccountTagRequest": {
+      "description": "The body of a Patch request to add tags to a Visual Studio account resource.",
+      "type": "object",
+      "properties": {
+       "tags": {
+          "description": "The custom tags of the resource.",
+          "type": "object",
+          "additionalProperties": {
+            "type": "string"
+          }
+       }
+      }
+    },
     "AccountResourceRequest": {
       "description": "The body of a PUT request to modify a Visual Studio account resource.",
       "type": "object",
diff --git a/specification/visualstudio/resource-manager/Microsoft.VisualStudio/preview/2014-04-01-preview/examples/UpdateTags.json b/specification/visualstudio/resource-manager/Microsoft.VisualStudio/preview/2014-04-01-preview/examples/UpdateTags.json
new file mode 100644
index 000000000000..a4a1c9582eab
--- /dev/null
+++ b/specification/visualstudio/resource-manager/Microsoft.VisualStudio/preview/2014-04-01-preview/examples/UpdateTags.json
@@ -0,0 +1,27 @@
+{
+    "parameters": {
+      "body": {
+        "tags": {"tag1":"value1"}
+       },
+      "subscriptionId": "0de7f055-dbea-498d-8e9e-da287eedca90",
+      "resourceGroupName": "VS-Example-Group",
+      "resourceName": "Example",
+      "api-version": "2014-04-01-preview"
+    },
+    "responses": {
+      "200": {
+        "body": {
+          "id": "/subscriptions/0de7f055-dbea-498d-8e9e-da287eedca90/resourceGroups/VS-Example-Group/providers/Microsoft.VisualStudio/account/Example",
+          "name": "VS-Example-Group",
+          "type": "Microsoft.VisualStudio/account",
+          "location": "Central US",
+          "tags": {},
+          "properties": {
+            "AccountURL": ""
+          }
+        }
+      },
+      "404": {
+      }
+    }
+  }
\ No newline at end of file