diff --git a/windows/security/threat-protection/windows-defender-antivirus/configure-block-at-first-sight-windows-defender-antivirus.md b/windows/security/threat-protection/windows-defender-antivirus/configure-block-at-first-sight-windows-defender-antivirus.md
index 6f9408675c..3231dff805 100644
--- a/windows/security/threat-protection/windows-defender-antivirus/configure-block-at-first-sight-windows-defender-antivirus.md
+++ b/windows/security/threat-protection/windows-defender-antivirus/configure-block-at-first-sight-windows-defender-antivirus.md
@@ -65,6 +65,9 @@ Block at first sight requires a number of settings to be configured correctly or
 
    ![Intune config](images/defender/intune-block-at-first-sight.png)
 
+> [!Warning]
+> Setting file blocking level to "High" will apply a strong level of detection. It may unlikely cause false-positive detection of legitimate files. In this case, use the option to [restore the quarantined files](https://docs.microsoft.com/windows/security/threat-protection/windows-defender-antivirus/restore-quarantined-files-windows-defender-antivirus).
+
 For more information about configuring Windows Defender Antivirus device restrictions in Intune, see [Configure device restriction settings in Microsoft Intune](https://docs.microsoft.com/intune/device-restrictions-configure).
 
 For a list of Windows Defender Antivirus device restrictions in Intune, see [Device restriction for Windows 10 (and newer) settings in Intune](https://docs.microsoft.com/intune/device-restrictions-windows-10#windows-defender-antivirus).