diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/extension/Compatability.java b/src/main/org/apache/tools/ant/taskdefs/optional/extension/Compatability.java
index da5a1cb19..20286ed20 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/extension/Compatability.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/extension/Compatability.java
@@ -58,6 +58,13 @@ package org.apache.tools.ant.taskdefs.optional.extension;
  * of one extension to another. See (@link Extension) for instances
  * of object.
  *
+ * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+ *  This file is from excalibur.extension package. Dont edit this file
+ * directly as there is no unit tests to make sure it is operational
+ * in ant. Edit file in excalibur and run tests there before changing
+ * ants file.
+ * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+ *
  * @author <a href="mailto:peter@apache.org">Peter Donald</a>
  * @version $Revision$ $Date$
  * @see Extension
diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/extension/DeweyDecimal.java b/src/main/org/apache/tools/ant/taskdefs/optional/extension/DeweyDecimal.java
index 1c9890626..a72d0f583 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/extension/DeweyDecimal.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/extension/DeweyDecimal.java
@@ -63,6 +63,13 @@ import java.util.StringTokenizer;
  * represent major, minor, micro, etc versions.  The version number
  * must begin with a number.
  *
+ * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+ *  This file is from excalibur.extension package. Dont edit this file
+ * directly as there is no unit tests to make sure it is operational
+ * in ant. Edit file in excalibur and run tests there before changing
+ * ants file.
+ * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+ *
  * @author <a href="mailto:peter@apache.org">Peter Donald</a>
  * @version $Revision$ $Date$
  */