add note about WAF logs

Author: duongau

articles/frontdoor/standard-premium/how-to-logs.md

@@ -5,7 +5,7 @@ services: front-door
 author: duongau
 ms.service: azure-frontdoor
 ms.topic: how-to
-ms.date: 03/27/2024
+ms.date: 01/06/2025
 ms.author: duau
 ---
 
@@ -29,6 +29,9 @@ Access logs, health probe logs, and Web Application Firewall (WAF) logs aren't e
 
 1. Select the **log** options for **FrontDoorAccessLog**, **FrontDoorHealthProbeLog**, and **FrontDoorWebApplicationFirewallLog**.
 
+   > [!NOTE]
+   > **FrontDoorWebApplicationFirewallLog** is only available for Premium tier.
+
 1. Select the **Destination details**. The destination options are: 
 
     * **Send to Log Analytics**