diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-07-02-preview/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-07-02-preview/managedClusters.json
index ed92d3008326..1049958d8c81 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-07-02-preview/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-07-02-preview/managedClusters.json
@@ -3380,6 +3380,14 @@
         },
         "hostGroupID": {
           "type": "string",
+          "format": "arm-id",
+          "x-ms-arm-id-details": {
+            "allowedResources": [
+              {
+                "type": "Microsoft.Compute/hostGroups"
+              }
+            ]
+          },
           "title": "The fully qualified resource ID of the Dedicated Host Group to provision virtual machines from, used only in creation scenario and not allowed to changed once set.",
           "description": "This is of the form: /subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/hostGroups/{hostGroupName}. For more information see [Azure dedicated hosts](https://docs.microsoft.com/azure/virtual-machines/dedicated-hosts)."
         }