Update antimalware.md

Author: dcbrown16

articles/security/fundamentals/antimalware.md

@@ -46,7 +46,7 @@ Microsoft Antimalware for Azure includes the Microsoft Antimalware Client and Se
 
 The Microsoft Antimalware Client and Service is installed by default in a disabled state in all supported Azure guest operating system families in the Cloud Services platform. The Microsoft Antimalware Client and Service is not installed by default in the Virtual Machines platform and is available as an optional feature through the Azure portal and Visual Studio Virtual Machine configuration under Security Extensions.
 
-When using Azure App Service, the underlying service that hosts the web app has Microsoft Antimalware enabled on it. This is used to protect Azure App Service infrastructure and does not run on customer content.
+When using Azure App Service on Windows, the underlying service that hosts the web app has Microsoft Antimalware enabled on it. This is used to protect Azure App Service infrastructure and does not run on customer content.
 
 > [!NOTE]
 > Windows Defender is the built-in Antimalware enabled in Windows Server 2016. The Windows Defender Interface is also enabled by default on some Windows Server 2016 SKU's [see here for more information](https://docs.microsoft.com/windows/threat-protection/windows-defender-antivirus/windows-defender-antivirus-on-windows-server-2016).