Update investigate-alerts.md

Author: yelevin

defender-xdr/investigate-alerts.md

@@ -127,7 +127,7 @@ Microsoft Defender XDR alerts come from solutions like Microsoft Defender for En
 | Microsoft Defender for Office 365 | `fa{GUID}` <br> Example: `fa123a456b-c789-1d2e-12f1g33h445h6i` |
 | Microsoft Defender for Endpoint | `da{GUID}` <br> `ed{GUID}` for alerts from custom detections |
 | Microsoft Defender for Identity | `aa{GUID}` <br> `ri{GUID}` for alerts from XDR detection engine <br> Example: `aa123a456b-c789-1d2e-12f1g33h445h6i`, `ri638724443630474445_-1629192583` |
-| Microsoft Defender for Cloud Apps |`ca{GUID}` <br> `rm{GUID}` for alerts from XDR detection engine <br> Example: `ca123a456b-c789-1d2e-12f1g33h445h6i` |
+| Microsoft Defender for Cloud Apps |`ca{GUID}` <br> `ma{GUID}` for alerts from App Governance detections and policies <br> `rm{GUID}` for alerts from XDR detection engine <br> Example: `ca123a456b-c789-1d2e-12f1g33h445h6i` |
 | Microsoft Entra ID Protection | `ad{GUID}` |
 | App Governance | `ma{GUID}` |
 | Microsoft Data Loss Prevention | `dl{GUID}` |