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diff --git a/docs/modules/ROOT/examples/observer/SubjectObserverProtocolImpl.java b/docs/modules/ROOT/examples/observer/SubjectObserverProtocolImpl.java
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+++ b/docs/modules/ROOT/examples/observer/SubjectObserverProtocolImpl.java
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+/*
+Copyright (c) Xerox Corporation 1998-2002.  All rights reserved.
+
+Use and copying of this software and preparation of derivative works based
+upon this software are permitted.  Any distribution of this software or
+derivative works must comply with all applicable United States export control
+laws.
+
+This software is made available AS IS, and Xerox Corporation makes no warranty
+about the software, its performance or its conformity to any specification.
+*/
+
+package observer;
+
+import java.util.Vector;
+
+aspect SubjectObserverProtocolImpl extends SubjectObserverProtocol {
+
+    declare parents: Button implements Subject;
+    public Object Button.getData() { return this; }
+
+    declare parents: ColorLabel implements Observer;
+    public void    ColorLabel.update() {
+        colorCycle();
+    }
+
+    pointcut stateChanges(Subject s):
+        target(s) &&
+        call(void Button.click());
+
+}