diff --git a/specification/trafficmanager/resource-manager/Microsoft.Network/stable/2018-08-01/trafficmanager.json b/specification/trafficmanager/resource-manager/Microsoft.Network/stable/2018-08-01/trafficmanager.json
index 021b1aafa6cc..a57ff9a37790 100644
--- a/specification/trafficmanager/resource-manager/Microsoft.Network/stable/2018-08-01/trafficmanager.json
+++ b/specification/trafficmanager/resource-manager/Microsoft.Network/stable/2018-08-01/trafficmanager.json
@@ -42,7 +42,16 @@
             "in": "path",
             "required": true,
             "type": "string",
-            "description": "The type of the Traffic Manager endpoint to be updated."
+            "description": "The type of the Traffic Manager endpoint to be updated.",
+            "enum": [
+              "AzureEndpoints",
+              "ExternalEndpoints",
+              "NestedEndpoints"
+            ],
+            "x-ms-enum": {
+              "name": "EndpointType",
+              "modelAsString": false
+            }
           },
           {
             "name": "endpointName",
@@ -113,7 +122,16 @@
             "in": "path",
             "required": true,
             "type": "string",
-            "description": "The type of the Traffic Manager endpoint."
+            "description": "The type of the Traffic Manager endpoint.",
+            "enum": [
+              "AzureEndpoints",
+              "ExternalEndpoints",
+              "NestedEndpoints"
+            ],
+            "x-ms-enum": {
+              "name": "EndpointType",
+              "modelAsString": false
+            }
           },
           {
             "name": "endpointName",
@@ -181,7 +199,16 @@
             "in": "path",
             "required": true,
             "type": "string",
-            "description": "The type of the Traffic Manager endpoint to be created or updated."
+            "description": "The type of the Traffic Manager endpoint to be created or updated.",
+            "enum": [
+              "AzureEndpoints",
+              "ExternalEndpoints",
+              "NestedEndpoints"
+            ],
+            "x-ms-enum": {
+              "name": "EndpointType",
+              "modelAsString": false
+            }
           },
           {
             "name": "endpointName",
@@ -267,7 +294,16 @@
             "in": "path",
             "required": true,
             "type": "string",
-            "description": "The type of the Traffic Manager endpoint to be deleted."
+            "description": "The type of the Traffic Manager endpoint to be deleted.",
+            "enum": [
+              "AzureEndpoints",
+              "ExternalEndpoints",
+              "NestedEndpoints"
+            ],
+            "x-ms-enum": {
+              "name": "EndpointType",
+              "modelAsString": false
+            }
           },
           {
             "name": "endpointName",