diff --git a/src/SOL005/NSPerformanceManagementNotification/definitions/SOL005NSPerformanceManagementNotification_def.yaml b/src/SOL005/NSPerformanceManagementNotification/definitions/SOL005NSPerformanceManagementNotification_def.yaml
index 11bebfd0b240af1565de4657e3557e8c641a4299..cf2f10a66ff4152579a18b6ca0d7d165f6ab8e91 100644
--- a/src/SOL005/NSPerformanceManagementNotification/definitions/SOL005NSPerformanceManagementNotification_def.yaml
+++ b/src/SOL005/NSPerformanceManagementNotification/definitions/SOL005NSPerformanceManagementNotification_def.yaml
@@ -5,6 +5,8 @@ definitions:
   PerformanceInformationAvailableNotification:
     description: >
       This notification informs the receiver that performance information is available.
+      The notification shall be triggered by the NFVO when new performance information 
+      collected by a PM job is available. 
     type: object
     required:
       - id