diff --git a/src/yang/etsi-nfv-vnf.yang b/src/yang/etsi-nfv-vnf.yang
index 37214e2a93a35ffc8a32d6e31c17821e9302af31..fd757232df5a20dcff4a3413da1f8242058c1270 100755
--- a/src/yang/etsi-nfv-vnf.yang
+++ b/src/yang/etsi-nfv-vnf.yang
@@ -94,9 +94,27 @@ submodule etsi-nfv-vnf {
            VirtualNetworkInterfaceRequirements information element";
       }
 
+      list standardized-network-interface-requirements {
+        key "key";
+        max-elements "1";
+
+        leaf key {
+          type string;
+        }
+        leaf value {
+          type string;
+        }
+        description
+          "The requirements on standardized network interface
+           capabilities, e.g., SR-IOV or secondary container
+           cluster network interface deployment requirements.";
+        reference
+          "GS NFV-IFA011: Section 7.1.6.6,
+           VirtualNetworkInterfaceRequirements information element";
+      }
+
       list network-interface-requirements {
         key "key";
-        min-elements "1";
         max-elements "1";
 
         leaf key {
@@ -106,9 +124,10 @@ submodule etsi-nfv-vnf {
           type string;
         }
         description
-          "The network interface requirements. An element from an
-           array of key-value pairs that articulate the network
-           interface deployment requirements.";
+          "The additional network interface requirements beyond those
+           specified in the standardizedNetworkInterfaceRequirementsattribute.
+           An element from an array of key-value pairs that articulate the
+           network interface deployment requirements.";
         reference
           "GS NFV-IFA011: Section 7.1.6.6,
            VirtualNetworkInterfaceRequirements information element";
@@ -1349,7 +1368,6 @@ submodule etsi-nfv-vnf {
       }
 
       leaf size {
-        mandatory true;
         type uint64;
         units "GB";
         description