diff --git a/src/yang/etsi-nfv-ns.yang b/src/yang/etsi-nfv-ns.yang
index ad5f9b3f5ccffb4471257459f880133c3b73aca3..40f655c929c2e270de184eedafd273716ef50a2e 100644
--- a/src/yang/etsi-nfv-ns.yang
+++ b/src/yang/etsi-nfv-ns.yang
@@ -1544,6 +1544,16 @@ 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";
+            }
           }
 	}
       }