Add a note about complete mode

Author: mumian

articles/azure-resource-manager/templates/deployment-modes.md

@@ -3,7 +3,7 @@ title: Deployment modes
 description: Describes how to specify whether to use a complete or incremental deployment mode with Azure Resource Manager.
 ms.topic: conceptual
 ms.custom: devx-track-arm-template
-ms.date: 04/02/2025
+ms.date: 04/28/2025
 ---
 
 # Azure Resource Manager deployment modes
@@ -36,6 +36,9 @@ In incremental mode, Resource Manager **leaves unchanged** resources that exist
 
 ## Complete mode
 
+> [!WARNING]
+> Complete mode is not recommended. If you wish to perform deletes with Bicep or ARM template deployments, use [Deployment stacks](../bicep/deployment-stacks.md).
+
 In complete mode, Resource Manager **deletes** resources that exist in the resource group but aren't specified in the template.
 
 > [!NOTE]