Merge branch 'master' of https://github.com/MicrosoftDocs/azure-docs-pr into fileVSev

Author: roygara

articles/web-application-firewall/ag/configure-waf-custom-rules.md

@@ -1,12 +1,12 @@
 ---
 title: Configure v2 custom rules using PowerShell
 titleSuffix: Azure Web Application Firewall
-description: Learn how to configure WAF v2 custom rules using Azure PowerShell. You can create your own rules evaluated for each request that passes through the firewall.
+description: Learn how to configure Web Application Firewall (WAF) v2 custom rules using Azure PowerShell. You can create your own rules evaluated for each request that passes through the firewall.
 services: web-application-firewall
 author: vhorne
 ms.service: web-application-firewall
 ms.topic: article
-ms.date: 11/16/2019
+ms.date: 05/21/2020
 ms.author: victorh
 ---
 
@@ -133,6 +133,19 @@ $appgw = New-AzApplicationGateway -Name $appgwName -ResourceGroupName $rgname `
   -FirewallPolicy $wafPolicy
 ```
 
+## Update your WAF
+
+After you create your WAF, you can update it using a procedure similar to the following code:
+
+```azurepowershell
+# Get the existing policy
+$policy = Get-AzApplicationGatewayFirewallPolicy -Name $policyName -ResourceGroupName $RGname
+# Add an existing rule named $rule
+$policy.CustomRules.Add($rule)
+# Update the policy
+Set-AzApplicationGatewayFirewallPolicy -InputObject $policy
+```
+
 ## Next steps
 
 [Learn more about Web Application Firewall on Application Gateway](ag-overview.md)