diff --git a/exchange/exchange-ps/ExchangePowerShell/Set-CASMailbox.md b/exchange/exchange-ps/ExchangePowerShell/Set-CASMailbox.md
index e565bff1a5..29c3173f2e 100644
--- a/exchange/exchange-ps/ExchangePowerShell/Set-CASMailbox.md
+++ b/exchange/exchange-ps/ExchangePowerShell/Set-CASMailbox.md
@@ -760,7 +760,7 @@ This parameter is functional only in on-premises Exchange.
 
 The IsOptimizedForAccessibility parameter specifies whether the mailbox is configured to use the light version of Outlook on the web. Valid values are:
 
-- $true: The mailbox is configured to use the light version of Outlook on the web.
+- $true: The mailbox is configured to use the light version of Outlook on the web. This value is required to fully utilize the light version of Outlook on the web.
 - $false: The mailbox isn't configured to use the light version of Outlook on the web.
 
 ```yaml