Merge pull request #286496 from austinmccollum/patch-1

add prepurchase plan

Author: prmerger-automator[bot]

articles/sentinel/whats-new.md

@@ -20,10 +20,18 @@ The listed features were released in the last three months. For information abou
 
 ## September 2024 
 
+
+- [Azure reservations now have pre-purchase plans available for Microsoft Sentinel](#pre-purchase-plans-now-available-for-microsoft-sentinel)
 - [Import/export of automation rules now generally available (GA)](#importexport-of-automation-rules-now-generally-available-ga)
 - [Google Cloud Platform data connectors are now generally available (GA)](#google-cloud-platform-data-connectors-are-now-generally-available-ga)
 - [Microsoft Sentinel now generally available (GA) in Azure Israel Central](#microsoft-sentinel-now-generally-available-ga-in-azure-israel-central)
 
+### Pre-purchase plans now available for Microsoft Sentinel
+
+Pre-purchase plans are a type of Azure reservation. When you buy a pre-purchase plan, you get commit units (CUs) at discounted tiers for a specific product. Microsoft Sentinel commit units (SCUs) apply towards eligible costs in your workspace. When you have predictable costs, choosing the right pre-purchase plan saves you money! 
+
+For more information, see [Optimize costs with a pre-purchase plan](billing-pre-purchase-plan.md).
+
 ### Import/export of automation rules now generally available (GA)
 
 The ability to export automation rules to Azure Resource Manager (ARM) templates in JSON format, and to import them from ARM templates, is now generally available after a [short preview period](#export-and-import-automation-rules-preview).