diff --git a/specification/eventgrid/resource-manager/Microsoft.EventGrid/preview/2020-10-15-preview/EventGrid.json b/specification/eventgrid/resource-manager/Microsoft.EventGrid/preview/2020-10-15-preview/EventGrid.json
index 045e22aa2f15..c9ddf62ed972 100644
--- a/specification/eventgrid/resource-manager/Microsoft.EventGrid/preview/2020-10-15-preview/EventGrid.json
+++ b/specification/eventgrid/resource-manager/Microsoft.EventGrid/preview/2020-10-15-preview/EventGrid.json
@@ -6797,6 +6797,7 @@
           "description": "The type of managed identity used. The type 'SystemAssigned, UserAssigned' includes both an implicitly created identity and a set of user-assigned identities. The type 'None' will remove any identity.",
           "enum": [
             "SystemAssigned",
+            "SystemAssigned, UserAssigned",
             "UserAssigned"
           ],
           "type": "string",