diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-11-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-11-01/managedClusters.json
index 696affb6f350..3efbf9a7776d 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-11-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-11-01/managedClusters.json
@@ -2786,7 +2786,8 @@
           "enum": [
             "rapid",
             "stable",
-            "patch"
+            "patch",
+            "none"
           ],
           "x-ms-enum": {
             "name": "upgradeChannel",