Update add-custom-domain.md

Based on internal customer escalation updating this doc.

Author: aanaparthi

articles/active-directory/fundamentals/add-custom-domain.md

@@ -55,7 +55,8 @@ After you create your directory, you can add your custom domain name.
     ![Custom domain names page, with Add custom domain page](media/add-custom-domain/add-custom-domain-blade.png)
 
     >[!IMPORTANT]
-    >You must include *.com*, *.net*, or any other top-level extension for this to work properly.
+    >You must include *.com*, *.net*, or any other top-level extension for this to work properly. 
+    >When adding a custom domain the Password Policy values will be inherited from the initial domain.
 
     The unverified domain is added. The **contoso.com** page appears showing your DNS information. Save this information. You need it later to create a TXT record to configure DNS.
 
@@ -114,4 +115,4 @@ If Azure AD can't verify a custom domain name, try the following suggestions:
 
 - Manage your domain name information in Azure AD. For more information, see [Managing custom domain names](../enterprise-users/domains-manage.md).
 
-- If you have on-premises versions of Windows Server that you want to use alongside Azure Active Directory, see [Integrate your on-premises directories with Azure Active Directory](../hybrid/whatis-hybrid-identity.md).
+- If you have on-premises versions of Windows Server that you want to use alongside Azure Active Directory, see [Integrate your on-premises directories with Azure Active Directory](../hybrid/whatis-hybrid-identity.md).