diff --git a/apps/iptopology-api/src/main/java/org/onosproject/iptopology/api/RouterId.java b/apps/iptopology-api/src/main/java/org/onosproject/iptopology/api/RouterId.java
index 85714cb..3c77e9a 100644
--- a/apps/iptopology-api/src/main/java/org/onosproject/iptopology/api/RouterId.java
+++ b/apps/iptopology-api/src/main/java/org/onosproject/iptopology/api/RouterId.java
@@ -29,7 +29,8 @@
     /**
      * Constructor to initialize its parameters.
      *
-     * @param routerId Router ID of designated router
+     * @param routerId  Router ID of designated router
+     * @param type      protocol type
      */
     public RouterId(int routerId, ProtocolType type) {
         this.routerId = routerId;