diff --git a/windows/security/threat-protection/microsoft-defender-atp/commercial-gov.md b/windows/security/threat-protection/microsoft-defender-atp/commercial-gov.md
index 5b520ffe75..26de307f2e 100644
--- a/windows/security/threat-protection/microsoft-defender-atp/commercial-gov.md
+++ b/windows/security/threat-protection/microsoft-defender-atp/commercial-gov.md
@@ -48,6 +48,7 @@ The following OS versions are not supported:
 - Windows 7 SP1 Pro
 - Windows 8 Pro
 - Windows 8.1 Enterprise
+- macOS
 
 The initial release of Microsoft Defender ATP will not have immediate parity with the commercial offering.  While our goal is to deliver all commercial features and functionality to our Azure Government environment, there are some capabilities not yet available that we'd like to highlight.  These are the known gaps as of August 2019: