diff --git a/specification/trafficmanager/resource-manager/readme.md b/specification/trafficmanager/resource-manager/readme.md
index 70071e96b8dc..b84775c85e95 100644
--- a/specification/trafficmanager/resource-manager/readme.md
+++ b/specification/trafficmanager/resource-manager/readme.md
@@ -51,6 +51,10 @@ directive:
     reason: This will cause breaking changes in .NET SDK
     from: trafficmanager.json
     where: $.definitions.Endpoint
+  - suppress: RequiredPropertiesMissingInResourceModel
+    reason: This will cause breaking changes in .NET SDK
+    from: trafficmanager.json
+    where: $.definitions.UserMetricsModel
 ```
 
 ### Tag: package-2018-04