diff --git a/windows/deployment/update/waas-restart.md b/windows/deployment/update/waas-restart.md
index 9d859d31c35..f8a52f39d12 100644
--- a/windows/deployment/update/waas-restart.md
+++ b/windows/deployment/update/waas-restart.md
@@ -69,6 +69,8 @@ To configure active hours using Group Policy, go to **Computer Configuration\Adm
 
 ![Use Group Policy to configure active hours.](images/waas-active-hours-policy.png)
 
+Note:  The max active hours length for Windows 10 1607 and Windows Server 2016 is 12.  Later versions support max active hours length of 18
+
 ### Configuring active hours with MDM
 
 MDM uses the [Update/ActiveHoursStart and Update/ActiveHoursEnd](/windows/client-management/mdm/policy-configuration-service-provider#Update_ActiveHoursEnd)  and [Update/ActiveHoursMaxRange](/windows/client-management/mdm/policy-configuration-service-provider#update-activehoursmaxrange) settings in the [Policy CSP](/windows/client-management/mdm/policy-configuration-service-provider) to configure active hours.
@@ -215,4 +217,4 @@ There are three different registry combinations for controlling restart behavior
 - [Configure Windows Update for Business](waas-configure-wufb.md)
 - [Integrate Windows Update for Business with management solutions](waas-integrate-wufb.md)
 - [Walkthrough: use Group Policy to configure Windows Update for Business](waas-wufb-group-policy.md)
-- [Walkthrough: use Intune to configure Windows Update for Business](/intune/windows-update-for-business-configure)
\ No newline at end of file
+- [Walkthrough: use Intune to configure Windows Update for Business](/intune/windows-update-for-business-configure)