property copy must be top level

Author: tfitzmac

articles/azure-resource-manager/templates/copy-properties.md

@@ -2,11 +2,13 @@
 title: Define multiple instances of a property
 description: Use copy operation in an Azure Resource Manager template to iterate multiple times when creating a property on a resource.
 ms.topic: conceptual
-ms.date: 04/14/2020
+ms.date: 09/15/2020
 ---
 # Property iteration in ARM templates
 
-This article shows you how to create more than one instance of a property in your Azure Resource Manager (ARM) template. By adding the **copy** element to the properties section of a resource in your template, you can dynamically set the number of items for a property during deployment. You also avoid having to repeat template syntax.
+This article shows you how to create more than one instance of a property in your Azure Resource Manager template (ARM template). By adding the **copy** element to the properties section of a resource in your template, you can dynamically set the number of items for a property during deployment. You also avoid having to repeat template syntax.
+
+You can only use copy with top-level resources, even when applying copy to a property. To learn about changing a child resource to a top-level resource, see [Iteration for a child resource](copy-resources.md#iteration-for-a-child-resource).
 
 You can also use copy with [resources](copy-resources.md), [variables](copy-variables.md), and [outputs](copy-outputs.md).