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diff --git a/libjava/classpath/java/util/Observer.java b/libjava/classpath/java/util/Observer.java
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+/* Observer.java -- an object that will be informed of changes in an Observable
+   Copyright (C) 1998, 1999, 2001, 2002, 2005  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.util;
+
+/**
+ * Interface that is implemented when a class wants to be informed of changes
+ * in Observable objects.
+ *
+ * @author Warren Levy (warrenl@cygnus.com)
+ * @see Observable
+ * @status updated to 1.4
+ */
+public interface Observer
+{
+  /**
+   * This method is called whenever the observable object changes, and has
+   * called <code>notifyObservers</code>. The Observable object can pass
+   * arbitrary information in the second parameter.
+   *
+   * @param observable the Observable object that changed
+   * @param arg arbitrary information, usually relating to the change
+   */
+  void update(Observable observable, Object arg);
+}