diff --git a/specification/subscription/resource-manager/Microsoft.Subscription/stable/2020-09-01/subscriptions.json b/specification/subscription/resource-manager/Microsoft.Subscription/stable/2020-09-01/subscriptions.json
index a4c186194cff..10aa6a32f048 100644
--- a/specification/subscription/resource-manager/Microsoft.Subscription/stable/2020-09-01/subscriptions.json
+++ b/specification/subscription/resource-manager/Microsoft.Subscription/stable/2020-09-01/subscriptions.json
@@ -460,6 +460,10 @@
         "subscriptionId": {
           "description": "This parameter can be used to create alias for existing subscription Id",
           "type": "string"
+        },
+        "resellerId": {
+          "description": "Reseller ID, basically MPN Id",
+          "type": "string"
         }
       }
     },