Give some clue that the classconstants filter has a dependency on BCEL.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@376769 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTypes/filterchain.html

@@ -146,7 +146,8 @@ distribution.
 <h3><a name="classconstants">ClassConstants</a></h3>
 <p>
 This filters basic constants defined in a Java Class,
-and outputs them in lines composed of the format name=value
+and outputs them in lines composed of the format <i>name</i>=<i>value</i>.
+See <a href="../install.html#librarydependencies">Library Dependencies</a>.
 <p>
 <h4>Example:</h4>
 
@@ -1398,5 +1399,5 @@ This may be used as follows:
 
 <hr>
 
-<p align=center>Copyright &copy; 2002-2005 The Apache Software Foundation. All rights
+<p align=center>Copyright &copy; 2002-2006 The Apache Software Foundation. All rights
 Reserved.</p></body></html>