diff --git a/windows/security/threat-protection/windows-defender-antivirus/microsoft-defender-atp-mac-install-manually.md b/windows/security/threat-protection/windows-defender-antivirus/microsoft-defender-atp-mac-install-manually.md
index ba4afb804d..da58cfffbd 100644
--- a/windows/security/threat-protection/windows-defender-antivirus/microsoft-defender-atp-mac-install-manually.md
+++ b/windows/security/threat-protection/windows-defender-antivirus/microsoft-defender-atp-mac-install-manually.md
@@ -83,6 +83,9 @@ The installation proceeds.
 > [!NOTE]
 > If you don't select **Allow**, the installation will proceed after 5 minutes. Defender ATP will be loaded, but real-time protection will be disabled.
 
+> [!NOTE]
+> macOS may request to reboot the machine upon the first installation of Microsoft Defender. Real-Time Protection will not be available until the machine is rebooted.
+
 ### Fixing disabled Real-Time Protection
 
 If you did not enable Microsoft's driver during installation, then the application displays a banner prompting you to enable it:
@@ -166,6 +169,13 @@ After installation, you'll see the Microsoft Defender icon in the macOS status b
 
    ![Microsoft Defender icon in status bar screenshot](images/MDATP_Icon_Bar.png)
 
+## Catalina
+
+> [!CAUTION]
+> macOS 10.15 (Catalina) does not allow us to scan certain user's directories (Documents, etc.) without a user's consent.
+
+To grant consent, open System Preferences, Security & Privacy, Privacy, Full Disk Access. Click the lock to make changes (bottom of the dialog box). Select Microsoft Defender.
+
 ## Logging installation issues
 
 See [Logging installation issues](microsoft-defender-atp-mac-resources.md#logging-installation-issues) for more information on how to find the automatically generated log that is created by the installer when an error occurs.