diff --git a/src/yang/etsi-nfv-ns.yang b/src/yang/etsi-nfv-ns.yang
index 8b0de4931d90f9d403c21bb1fd6b1bfc44d66f7d..5397066ca1a70f44ffb26ad704435655bd7e9ad3 100644
--- a/src/yang/etsi-nfv-ns.yang
+++ b/src/yang/etsi-nfv-ns.yang
@@ -269,6 +269,7 @@ submodule etsi-nfv-ns {
           }
 
           container qos {
+	    presence "VL QoS parameters";
             description
               "The QoS information element specifies quality of
                service parameters applicable to a VL.";
diff --git a/src/yang/etsi-nfv-vnf.yang b/src/yang/etsi-nfv-vnf.yang
index 7b16bbaa797591540186e5e62e8b1aa44df9140b..3be1321defcfbdf383f132f12e03a095e7d07652 100755
--- a/src/yang/etsi-nfv-vnf.yang
+++ b/src/yang/etsi-nfv-vnf.yang
@@ -700,7 +700,7 @@ submodule etsi-nfv-vnf {
               fraction-digits 1;
               range "0..max";
             }
-            units "MBytes";
+            units "Gb";
             default 1;
             description
               "Amount of virtual memory in MB.";
@@ -877,7 +877,7 @@ submodule etsi-nfv-vnf {
         leaf size-of-storage {
           type uint64;
           units "Gb";
-          default 1;
+          default 0;
           description
             "Size of virtualised storage resource (e.g. size of
              volume, in Gb)";
@@ -1187,6 +1187,7 @@ submodule etsi-nfv-vnf {
                information element.";
           }
           container qos {
+	    presence "VL QoS parameters";
             description
               "QoS of the VL.";
             reference