diff --git a/specification/azurestackhci/resource-manager/Microsoft.AzureStackHCI/stable/2020-10-01/azurestackhci.json b/specification/azurestackhci/resource-manager/Microsoft.AzureStackHCI/stable/2020-10-01/azurestackhci.json
index 17800e196037..7971c98d0d30 100644
--- a/specification/azurestackhci/resource-manager/Microsoft.AzureStackHCI/stable/2020-10-01/azurestackhci.json
+++ b/specification/azurestackhci/resource-manager/Microsoft.AzureStackHCI/stable/2020-10-01/azurestackhci.json
@@ -352,6 +352,12 @@
         }
       ],
       "properties": {
+        "systemData": {
+          "description": "System data of Cluster resource",
+          "$ref": "../../../../../common-types/resource-management/v2/types.json#/definitions/systemData",
+          "x-ms-client-flatten": true,
+          "readOnly": true
+        },
         "properties": {
           "description": "Cluster properties.",
           "$ref": "#/definitions/ClusterProperties",