add prereq

Author: aczechowski

memdocs/configmgr/core/get-started/2022/includes/2201/4639895.md

@@ -18,6 +18,10 @@ If a site system has both the distribution point and software update point roles
 
 For more general information on Windows LEDBAT, see [Fundamental concepts for content management](../../../../plan-design/hierarchy/fundamental-concepts-for-content-management.md#windows-ledbat).
 
+### Prerequisites for LEDBAT on software update points
+
+To use LEDBAT in this scenario, install the software update point role on a site system running Windows Server 2016 or later.
+
 ### Try it out!
 
 Try to complete the tasks. Then send [Feedback](../../../../understand/product-feedback.md) with your thoughts on the feature.