Fixed javadocs.

Change-Id: I6c0e5f59138ee024a858994a290da75a0f54a71f
diff --git a/utils/nio/src/main/java/org/onlab/nio/service/IOLoopMessaging.java b/utils/nio/src/main/java/org/onlab/nio/service/IOLoopMessaging.java
index 70f2f76..69b312a 100644
--- a/utils/nio/src/main/java/org/onlab/nio/service/IOLoopMessaging.java
+++ b/utils/nio/src/main/java/org/onlab/nio/service/IOLoopMessaging.java
@@ -100,6 +100,7 @@
     /**
      * Activates IO Loops.
      *
+     * @param localEp local end-point
      * @throws IOException is activation fails
      */
     public void start(Endpoint localEp) throws IOException {