Update whats-new-overview.md

Author: JarbasHorst

concepts/whats-new-overview.md

@@ -19,6 +19,10 @@ For details about previous updates to Microsoft Graph, see [Microsoft Graph what
 
 ## December 2024: New and generally available
 
+### Security | Alerts and incidents
+
+Enabled the **description**, **displayName**, and **severity** properties as supported properties in an [Update incident](/graph/api/resources/security-incident) request.
+
 ### Teamwork and communications | Shift management
 
 - [Stage the deletion](/graph/api/changetrackedentity-stagefordeletion) of an [openShift](/graph/api/resources/openshift), [shift](/graph/api/resources/shift), or [timeOff](/graph/api/resources/timeoff) instance in a [schedule](/graph/api/resources/schedule) in draft mode.
@@ -30,6 +34,10 @@ For details about previous updates to Microsoft Graph, see [Microsoft Graph what
 
 The Microsoft 365 monitoring APIs provide telemetry data to monitor the health of various Microsoft services within a Microsoft 365 subscription for your organization. Use the new operations in the [serviceActivity](/graph/api/resources/serviceactivity?view=graph-rest-beta&preserve-view=true) resource to get telemetry data for Exchange Online, Microsoft 365 Apps, and Microsoft Teams.
 
+### Security | Alerts and incidents
+
+Enabled the **description**, **displayName**, and **severity** properties as supported properties in an [Update incident](/graph/api/resources/security-incident?view=graph-rest-beta&preserve-view=true) request.
+
 ### Sites and lists
 
 Create and manage a [news link page](/graph/api/resources/newslinkpage?view=graph-rest-beta&preserve-view=true) in SharePoint.