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 f06d4937e701..a6683fa1645b 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
@@ -2603,6 +2603,10 @@
         "enablePrivateCluster": {
           "type": "boolean",
           "description": "Whether to create the cluster as a private cluster or not."
+        },
+        "privateDNSZone": {
+          "type": "string",
+          "description": "Private dns zone mode for private cluster. "
         }
       },
       "description": "Access profile for managed cluster API server."