diff --git a/specification/iothub/resource-manager/Microsoft.Devices/preview/2021-03-03-preview/iothub.json b/specification/iothub/resource-manager/Microsoft.Devices/preview/2021-03-03-preview/iothub.json
index 98d5554a1b74..c4200dd53b3a 100644
--- a/specification/iothub/resource-manager/Microsoft.Devices/preview/2021-03-03-preview/iothub.json
+++ b/specification/iothub/resource-manager/Microsoft.Devices/preview/2021-03-03-preview/iothub.json
@@ -2283,6 +2283,10 @@
             "name": "PublicNetworkAccess"
           }
         },
+        "disableLocalAuth": {
+          "description": "If True, authentication of Data Plane service APIs on IotHub will strictly use Azure Active Directory(AAD) based authentication.",
+          "type": "boolean"
+        },
         "ipFilterRules": {
           "description": "The IP filter rules.",
           "type": "array",