--- old/src/share/classes/java/util/prefs/PreferenceChangeListener.java	2013-02-06 18:05:14.000000000 -0800
+++ new/src/share/classes/java/util/prefs/PreferenceChangeListener.java	2013-02-06 18:05:14.000000000 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -34,6 +34,7 @@
  * @see NodeChangeListener
  * @since   1.4
  */
+@FunctionalInterface
 public interface PreferenceChangeListener extends java.util.EventListener {
     /**
      * This method gets called when a preference is added, removed or when