--- a/jdk/src/share/classes/java/util/prefs/AbstractPreferences.java	Thu Jun 27 10:21:22 2013 +0100
+++ b/jdk/src/share/classes/java/util/prefs/AbstractPreferences.java	Thu Jun 27 11:06:46 2013 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2012, 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
@@ -1121,6 +1121,8 @@
      * removed.  (The implementor needn't check for any of these things.)
      *
      * <p>This method is invoked with the lock on this node held.
+     * @param key the key
+     * @param value the value
      */
     protected abstract void putSpi(String key, String value);
 
@@ -1139,6 +1141,7 @@
      *
      * <p>This method is invoked with the lock on this node held.
      *
+     * @param key the key
      * @return the value associated with the specified key at this preference
      *          node, or <tt>null</tt> if there is no association for this
      *          key, or the association cannot be determined at this time.
@@ -1152,6 +1155,7 @@
      * (The implementor needn't check for either of these things.)
      *
      * <p>This method is invoked with the lock on this node held.
+     * @param key the key
      */
     protected abstract void removeSpi(String key);
 

--- a/jdk/src/share/classes/java/util/prefs/PreferencesFactory.java	Thu Jun 27 10:21:22 2013 +0100
+++ b/jdk/src/share/classes/java/util/prefs/PreferencesFactory.java	Thu Jun 27 11:06:46 2013 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2005, 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
@@ -45,6 +45,7 @@
     /**
      * Returns the system root preference node.  (Multiple calls on this
      * method will return the same object reference.)
+     * @return the system root preference node
      */
     Preferences systemRoot();
 
@@ -52,6 +53,8 @@
      * Returns the user root preference node corresponding to the calling
      * user.  In a server, the returned value will typically depend on
      * some implicit client-context.
+     * @return the user root preference node corresponding to the calling
+     * user
      */
     Preferences userRoot();
 }