diff --git a/src/main/java/io/github/parubok/button/group/KButtonGroup.java b/src/main/java/io/github/parubok/button/group/KButtonGroup.java
index 655e34f..1eb7727 100644
--- a/src/main/java/io/github/parubok/button/group/KButtonGroup.java
+++ b/src/main/java/io/github/parubok/button/group/KButtonGroup.java
@@ -127,7 +127,8 @@ public void removeListener(KButtonGroupListener<K> listener) {
     }
 
     /**
-     * @param listener The group will delegate button 'selected' event to this listener.
+     * @param listener The group will delegate button's 'selected' {@link java.awt.event.ItemEvent} to this
+     * listener.
      */
     public void addItemListener(ItemListener listener) {
         listenerList.add(ItemListener.class, listener);