diff --git a/docs/manual/install.html b/docs/manual/install.html
index 692b0aa2f..37a204b99 100644
--- a/docs/manual/install.html
+++ b/docs/manual/install.html
@@ -356,7 +356,9 @@ you need jakarta-oro 2.0.1 or later, and <a href="#commons-net">commons-net</a><
   </tr>
   <tr>
     <td>jython.jar</td>
-    <td>Python with script task</td>
+    <td>Python with script task<br>
+    Warning : jython.jar also contains classes from jakarta-oro.
+    Remove these classes if you are also using jakarta-oro.</td>
     <td><a href="http://jython.sourceforge.net/" target="_top">http://jython.sourceforge.net/</a></td>
   </tr>
   <tr>