Clarify regions for BYOS images

Author: asinn826

articles/virtual-machines/workloads/redhat/byos.md

@@ -22,6 +22,9 @@ ms.author: alsin
 
 Red Hat Enterprise Linux (RHEL) images are available in Azure via a pay-as-you-go (PAYG) or bring-your-own-subscription (Red Hat Gold Image) model. This document provides an overview of the Red Hat Gold Images in Azure.
 
+>[!NOTE]
+> RHEL BYOS Gold Images are available in Azure public (commercial) and in Azure Government clouds. They are not available in Azure China or Azure Blackforest clouds.
+
 ## Important points to consider
 
 - The Red Hat Gold Images provided in this program are production-ready RHEL images similar the RHEL PAYG images in the Azure Gallery/Marketplace.