diff --git a/src/definitions/SOL002SOL003VNFPerformanceManagement_def.yaml b/src/definitions/SOL002SOL003VNFPerformanceManagement_def.yaml
index 4c4afa668c47e1de4217d7404778406bb7b683b1..cd7f81034b9bd138bed2adf3a38937ae10573e2b 100644
--- a/src/definitions/SOL002SOL003VNFPerformanceManagement_def.yaml
+++ b/src/definitions/SOL002SOL003VNFPerformanceManagement_def.yaml
@@ -459,8 +459,8 @@ definitions:
     properties: 
       performanceMetric:
         description: >
-          Defines the performance metric associated with the
-          threshold, as specified in ETSI GS NFV-IFA 027).
+          Defines the performance metric associated with the threshold.
+          Valid values are specified as "Measurement Name" values in clause 7.2 of ETSI GS NFV-IFA 027.
         type: string
       thresholdType:
         description: >