diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/classifier/ClassifierService.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/classifier/ClassifierService.java
index a15da3e..74040c5 100644
--- a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/classifier/ClassifierService.java
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/classifier/ClassifierService.java
@@ -31,11 +31,15 @@
 
     /**
      * Add Classifier device for sfc.
+     *
+     * @param deviceId device id
      */
     void addClassifier(DeviceId deviceId);
 
     /**
      * Remove Classifier device for sfc.
+     *
+     * @param deviceId deviceId
      */
     void removeClassifier(DeviceId deviceId);
 }