diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2018-11-01/ddosProtectionPlan.json b/specification/network/resource-manager/Microsoft.Network/stable/2018-11-01/ddosProtectionPlan.json
index b20425a6aad6..8e9bc233d5ce 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2018-11-01/ddosProtectionPlan.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2018-11-01/ddosProtectionPlan.json
@@ -180,6 +180,57 @@
             "$ref": "./examples/DdosProtectionPlanCreate.json"
           }
         }
+      },
+      "patch": {
+        "tags": [
+          "DdosProtectionPlans"
+        ],
+        "operationId": "DdosProtectionPlans_Update",
+        "description": "Update a DDoS protection plan",
+        "parameters": [
+          {
+            "name": "resourceGroupName",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "description": "The name of the resource group."
+          },
+          {
+            "name": "ddosProtectionPlanName",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "description": "The name of the DDoS protection plan."
+          },
+          {
+            "name": "parameters",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "./network.json#/definitions/TagsObject"
+            },
+            "description": "Parameters supplied to the update DDoS protection plan resource."
+          },
+          {
+            "$ref": "./network.json#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "./network.json#/parameters/SubscriptionIdParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Update successful.",
+            "schema": {
+              "$ref": "#/definitions/DdosProtectionPlan"
+            }
+          }
+        },
+        "x-ms-examples": {
+          "DDoS protection plan Update tags": {
+            "$ref": "./examples/DdosProtectionPlanUpdate.json"
+          }
+        }
       }
     },
     "/subscriptions/{subscriptionId}/providers/Microsoft.Network/ddosProtectionPlans": {
diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2018-11-01/examples/DdosProtectionPlanUpdate.json b/specification/network/resource-manager/Microsoft.Network/stable/2018-11-01/examples/DdosProtectionPlanUpdate.json
new file mode 100644
index 000000000000..f996a336c528
--- /dev/null
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2018-11-01/examples/DdosProtectionPlanUpdate.json
@@ -0,0 +1,33 @@
+{
+  "parameters": {
+    "api-version": "2018-11-01",
+    "subscriptionId": "subid",
+    "resourceGroupName": "rg1",
+    "ddosProtectionPlanName": "test-plan",
+    "parameters": {
+      "tags": {
+          "tag1": "value1",
+          "tag2": "value2"
+      }
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "name": "test-plan",
+        "id": "/subscriptions/subid/resourceGroups/rg1/providers/Microsoft.Network/ddosProtectionPlans/test-plan",
+        "type": "Microsoft.Network/ddosProtectionPlans",
+        "location": "westus",
+        "tags": {
+            "tag1": "value1",
+            "tag2": "value2"
+        },
+        "properties": {
+          "provisioningState": "Succeeded",
+          "resourceGuid": "00000000-0000-0000-0000-000000000000",
+          "virtualNetworks": []
+        }
+      }
+    }
+  }
+}
diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2018-12-01/ddosProtectionPlan.json b/specification/network/resource-manager/Microsoft.Network/stable/2018-12-01/ddosProtectionPlan.json
index 7ebc2a166b60..727d8c90d88e 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2018-12-01/ddosProtectionPlan.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2018-12-01/ddosProtectionPlan.json
@@ -180,6 +180,57 @@
             "$ref": "./examples/DdosProtectionPlanCreate.json"
           }
         }
+      },
+      "patch": {
+        "tags": [
+          "DdosProtectionPlans"
+        ],
+        "operationId": "DdosProtectionPlans_Update",
+        "description": "Update a DDoS protection plan",
+        "parameters": [
+          {
+            "name": "resourceGroupName",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "description": "The name of the resource group."
+          },
+          {
+            "name": "ddosProtectionPlanName",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "description": "The name of the DDoS protection plan."
+          },
+          {
+            "name": "parameters",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "./network.json#/definitions/TagsObject"
+            },
+            "description": "Parameters supplied to the update DDoS protection plan resource."
+          },
+          {
+            "$ref": "./network.json#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "./network.json#/parameters/SubscriptionIdParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Update successful.",
+            "schema": {
+              "$ref": "#/definitions/DdosProtectionPlan"
+            }
+          }
+        },
+        "x-ms-examples": {
+          "DDoS protection plan Update tags": {
+            "$ref": "./examples/DdosProtectionPlanUpdate.json"
+          }
+        }
       }
     },
     "/subscriptions/{subscriptionId}/providers/Microsoft.Network/ddosProtectionPlans": {
diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2018-12-01/examples/DdosProtectionPlanUpdate.json b/specification/network/resource-manager/Microsoft.Network/stable/2018-12-01/examples/DdosProtectionPlanUpdate.json
new file mode 100644
index 000000000000..499288163fa0
--- /dev/null
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2018-12-01/examples/DdosProtectionPlanUpdate.json
@@ -0,0 +1,33 @@
+{
+  "parameters": {
+    "api-version": "2018-12-01",
+    "subscriptionId": "subid",
+    "resourceGroupName": "rg1",
+    "ddosProtectionPlanName": "test-plan",
+    "parameters": {
+      "tags": {
+          "tag1": "value1",
+          "tag2": "value2"
+      }
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "name": "test-plan",
+        "id": "/subscriptions/subid/resourceGroups/rg1/providers/Microsoft.Network/ddosProtectionPlans/test-plan",
+        "type": "Microsoft.Network/ddosProtectionPlans",
+        "location": "westus",
+        "tags": {
+            "tag1": "value1",
+            "tag2": "value2"
+        },
+        "properties": {
+          "provisioningState": "Succeeded",
+          "resourceGuid": "00000000-0000-0000-0000-000000000000",
+          "virtualNetworks": []
+        }
+      }
+    }
+  }
+}