diff --git a/etc/dhcp_agent.ini b/etc/dhcp_agent.ini
index 3c86847bf9..2f7c2339dc 100644
--- a/etc/dhcp_agent.ini
+++ b/etc/dhcp_agent.ini
@@ -14,12 +14,13 @@
 # The DHCP requires that an inteface driver be set.  Choose the one that best
 # matches you plugin.
 
-# OVS
+# OVS based plugins(OVS, Ryu, NEC, NVP, BigSwitch/Floodlight)
 interface_driver = quantum.agent.linux.interface.OVSInterfaceDriver
+# OVS based plugins(Ryu, NEC, NVP, BigSwitch/Floodlight) that use OVS
+# as OpenFlow switch and check port status
+#ovs_use_veth = True
 # LinuxBridge
 #interface_driver = quantum.agent.linux.interface.BridgeInterfaceDriver
-# Ryu
-#interface_driver = quantum.agent.linux.interface.RyuInterfaceDriver
 
 # The agent can use other DHCP drivers.  Dnsmasq is the simplest and requires
 # no additional setup of the DHCP server.
diff --git a/etc/l3_agent.ini b/etc/l3_agent.ini
index 84149cd6a6..9e6190cdd6 100644
--- a/etc/l3_agent.ini
+++ b/etc/l3_agent.ini
@@ -5,8 +5,11 @@
 # L3 requires that an interface driver be set.  Choose the one that best
 # matches your plugin.
 
-# OVS
+# OVS based plugins (OVS, Ryu, NEC) that supports L3 agent
 interface_driver = quantum.agent.linux.interface.OVSInterfaceDriver
+# OVS based plugins(Ryu, NEC) that use OVS
+# as OpenFlow switch and check port status
+#ovs_use_veth = True
 # LinuxBridge
 #interface_driver = quantum.agent.linux.interface.BridgeInterfaceDriver