diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2020-08-01/examples/ExpressRouteGatewayUpdateTags.json b/specification/network/resource-manager/Microsoft.Network/stable/2020-08-01/examples/ExpressRouteGatewayUpdateTags.json
new file mode 100644
index 000000000000..0868a1dcf7d9
--- /dev/null
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2020-08-01/examples/ExpressRouteGatewayUpdateTags.json
@@ -0,0 +1,36 @@
+{
+  "parameters": {
+    "expressRouteGatewayName": "expressRouteGatewayName",
+    "resourceGroupName": "resourceGroupName",
+    "api-version": "2020-08-01",
+    "subscriptionId": "subid",
+    "expressRouteGatewayParameters": {
+      "tags": {
+        "tag1": "value1",
+        "tag2": "value2"
+      }
+    }
+  },
+  "responses": {
+    "202": {},
+    "200": {
+      "body": {
+        "name": "expressRouteGatewayName",
+        "id": "/subscriptions/subid/resourceGroups/resourceGroupName/providers/Microsoft.Network/expressRouteGateways/expressRouteGatewayName",
+        "etag": "w/\\00000000-0000-0000-0000-000000000000\\",
+        "location": "westus",
+        "type": "Microsoft.Network/expressRouteGateways",
+        "tags": {
+          "tag1": "value1",
+          "tag2": "value2"
+        },
+        "properties": {
+          "provisioningState": "Succeeded",
+          "virtualHub": {
+            "id": "/subscriptions/subid/resourceGroups/resourceGroupName/providers/Microsoft.Network/virtualHubs/virtualHubName"
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2020-08-01/virtualWan.json b/specification/network/resource-manager/Microsoft.Network/stable/2020-08-01/virtualWan.json
index e0d7059bc7dc..482199ab7315 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2020-08-01/virtualWan.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2020-08-01/virtualWan.json
@@ -3781,6 +3781,70 @@
           "final-state-via": "azure-async-operation"
         }
       },
+      "patch": {
+        "tags": [
+          "ExpressRouteGateways"
+        ],
+        "operationId": "ExpressRouteGateways_UpdateTags",
+        "x-ms-examples": {
+          "ExpressRouteGatewayUpdate": {
+            "$ref": "./examples/ExpressRouteGatewayUpdateTags.json"
+          }
+        },
+        "description": "Updates express route gateway tags.",
+        "parameters": [
+          {
+            "$ref": "./network.json#/parameters/SubscriptionIdParameter"
+          },
+          {
+            "name": "resourceGroupName",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "description": "The resource group name of the ExpressRouteGateway."
+          },
+          {
+            "name": "expressRouteGatewayName",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "description": "The name of the gateway."
+          },
+          {
+            "$ref": "./network.json#/parameters/ApiVersionParameter"
+          },
+          {
+            "name": "expressRouteGatewayParameters",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "./network.json#/definitions/TagsObject"
+            },
+            "description": "Parameters supplied to update a virtual wan express route gateway tags."
+          }
+        ],
+        "responses": {
+          "202": {
+            "description": "Accepted and the operation will complete asynchronously."
+          },
+          "200": {
+            "description": "Request successful. Returns the details of the updated gateway.",
+            "schema": {
+              "$ref": "#/definitions/ExpressRouteGateway"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "./network.json#/definitions/CloudError"
+            }
+          }
+        },
+        "x-ms-long-running-operation": true,
+        "x-ms-long-running-operation-options": {
+          "final-state-via": "azure-async-operation"
+        }
+      },
       "get": {
         "tags": [
           "ExpressRouteGateways"