javadoc fixes

Change-Id: I3b4fc2d99f42b2413a535fb411b9c19bdd186ad8
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficSelector.java b/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficSelector.java
index 352f604..413473f 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficSelector.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficSelector.java
@@ -99,6 +99,7 @@
      * Returns a new traffic selector builder primed to produce entities
      * patterned after the supplied selector.
      *
+     * @param selector base selector
      * @return traffic selector builder
      */
     public static TrafficSelector.Builder builder(TrafficSelector selector) {