update head node notes
diff --git a/xos/configurations/cord/README-VTN.md b/xos/configurations/cord/README-VTN.md
index 3d61940..3590fe5 100644
--- a/xos/configurations/cord/README-VTN.md
+++ b/xos/configurations/cord/README-VTN.md
@@ -128,6 +128,7 @@
     
 On head node:
 
+    ovs-vsctl del-br br-flat-lan-1
     ifconfig eth2 10.123.0.1
     iptables --table nat --append POSTROUTING --out-interface br-ex -j MASQUERADE
     arp -s 10.123.0.3 fa:16:3e:ea:11:0a