Merge pull request #49894 from cherylmc/vwan2

update

Author: PRMerger10

articles/virtual-wan/virtual-wan-configure-automation-providers.md

@@ -6,7 +6,7 @@ author: cherylmc
 
 ms.service: virtual-wan
 ms.topic: conceptual
-ms.date: 07/10/2018
+ms.date: 08/23/2018
 ms.author: cherylmc
 Customer intent: As a Virtual WAN software-defined connectivity provider, I want to set up a provisioning environment.
 ---
@@ -19,7 +19,7 @@ Software-defined connectivity solutions typically use a controller or a device p
 
 ##  <a name="access"></a>Access control
 
-Customers must be able to set up appropriate access control for Virtual WAN in the device UI. This is recommended using an Azure Service Principal. Service principal-based access provides the device controller appropriate authentication to upload branch information.
+Customers must be able to set up appropriate access control for Virtual WAN in the device UI. This is recommended using an Azure Service Principal. Service principal-based access provides the device controller appropriate authentication to upload branch information. For more information,see [Create service principal](../azure-resource-manager/resource-group-create-service-principal-portal.md#create-an-azure-active-directory-application).
 
 ##  <a name="site"></a>Upload branch information