Merge pull request #109052 from DCtheGeek/dmc-bp-locks

Clarify locks

Author: PRMerger18

articles/governance/blueprints/concepts/resource-locking.md

@@ -1,7 +1,7 @@
 ---
 title: Understand resource locking
 description: Learn about the locking options in Azure Blueprints to protect resources when assigning a blueprint.
-ms.date: 02/27/2020
+ms.date: 03/25/2020
 ms.topic: conceptual
 ---
 # Understand resource locking in Azure Blueprints
@@ -11,6 +11,11 @@ maintain that consistency. This article explains how resource locking works in A
 see an example of resource locking and application of _deny assignments_, see the
 [protecting new resources](../tutorials/protect-new-resources.md) tutorial.
 
+> [!NOTE]
+> Resource locks deployed by Azure Blueprints are only applied to resources deployed by the
+> blueprint assignment. Existing resources, such as those in resource groups that already exist,
+> don't have locks added to them.
+
 ## Locking modes and states
 
 Locking Mode applies to the blueprint assignment and it has three options: **Don't Lock**, **Read