diff --git a/src/yang/etsi-nfv-ns.yang b/src/yang/etsi-nfv-ns.yang
index bfe1931f5b38987c94eaed70267827d23d718827..69bb800a518cf1f53ce646a8b008ed2eb2bf2e27 100644
--- a/src/yang/etsi-nfv-ns.yang
+++ b/src/yang/etsi-nfv-ns.yang
@@ -1523,6 +1523,16 @@ submodule etsi-nfv-ns {
                 "GS NFV IFA014: Section 6.2.8.2 MonitoringParameter
                  information element";
             }
+
+            leaf collection-period {
+              type string;
+              description
+                "An attribute that describes the periodicity at
+                 which to collect the performance information.";
+              reference
+                "GS NFV IFA014: Section 6.2.8.2 MonitoringParameter
+                 information element";
+            }
           }
 	}
       }