diff --git a/windows/security/threat-protection/windows-defender-atp/alerts-queue-windows-defender-advanced-threat-protection.md b/windows/security/threat-protection/windows-defender-atp/alerts-queue-windows-defender-advanced-threat-protection.md
index 850fea7739..98be2b2beb 100644
--- a/windows/security/threat-protection/windows-defender-atp/alerts-queue-windows-defender-advanced-threat-protection.md
+++ b/windows/security/threat-protection/windows-defender-atp/alerts-queue-windows-defender-advanced-threat-protection.md
@@ -77,7 +77,7 @@ Corresponds to the automated investigation state.
 You can choose between showing alerts that are assigned to you or automation.
 
 ### Detection source
-Select the source that triggered the alert detection.
+Select the source that triggered the alert detection.  Microsoft Threat Experts preview participants can now filter and see detections from the new threat experts managed hunting service. 
 
 >[!NOTE]
 >The Windows Defender Antivirus filter will only appear if machines are using Windows Defender Antivirus as the default real-time protection antimalware product.