diff --git a/src/yang/etsi-nfv-ns.yang b/src/yang/etsi-nfv-ns.yang
index 82d649ec87a7773c7ffbacd9793b27b0ccbb2f50..d55215eab4606fe50c00a63d714cc7d1e7e6ed9c 100644
--- a/src/yang/etsi-nfv-ns.yang
+++ b/src/yang/etsi-nfv-ns.yang
@@ -1479,6 +1479,16 @@ 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";
+            }
           }
 	}
       }