diff --git a/apps/openstacknetworking/openstackrouting/src/main/java/org/onosproject/openstacknetworking/routing/OpenstackRoutingRulePopulator.java b/apps/openstacknetworking/openstackrouting/src/main/java/org/onosproject/openstacknetworking/routing/OpenstackRoutingRulePopulator.java
index a9421bb..b226001 100644
--- a/apps/openstacknetworking/openstackrouting/src/main/java/org/onosproject/openstacknetworking/routing/OpenstackRoutingRulePopulator.java
+++ b/apps/openstacknetworking/openstackrouting/src/main/java/org/onosproject/openstacknetworking/routing/OpenstackRoutingRulePopulator.java
@@ -120,7 +120,7 @@
      *  @param inboundPacket Packet-in event packet
      * @param openstackPort Target VM information
      * @param portNum Pnat port number
-     * @param externalIp
+     * @param externalIp external ip address
      * @param externalInterfaceMacAddress Gateway external interface macaddress
      * @param externalRouterMacAddress Outer(physical) router`s macaddress
      */