diff --git a/src/yang/etsi-nfv-ns.yang b/src/yang/etsi-nfv-ns.yang
index 7667b7b0c65a48a41504f83f6e5747b21af95114..fd4159851866e698d4a0be3284ca92312507e93a 100644
--- a/src/yang/etsi-nfv-ns.yang
+++ b/src/yang/etsi-nfv-ns.yang
@@ -1655,6 +1655,22 @@ submodule etsi-nfv-ns {
           }
         }
       }
+
+      leaf priority {
+        type uint32;
+        description
+          "Specifies the priority for the NS instance.
+
+           The allowed range will be reasonably high. The 'zero'
+           value will express the highest priority and the fact
+           that the NS instance based on this DF cannot be
+           pre-empted during resource allocation.
+
+           Examples for the usage of priority include conflict
+           resolution in case of resource shortage.";
+        reference
+          "GS NFV IFA014: Section 6.3.2.2 NsDf information element";
+      }
     }
     uses security-parameters;
   }