Index: main/war/resources/help/ant/ant-buildfile.html
===================================================================
--- main/war/resources/help/ant/ant-buildfile.html	(revision 10534)
+++ main/war/resources/help/ant/ant-buildfile.html	(working copy)
@@ -1,5 +1,6 @@
 <div>
   If your build requires a custom <a href="http://ant.apache.org/manual/running.html#options">-buildfile</a>,
   specify it here.  By default Ant will use the <code>build.xml</code> in the root directory, 
-  this option can be used to use build files with a different name or in a subdirectory.
+  this option can be used to use build files with a different name or in a subdirectory. Note that in that
+  case, ant will be started from the directory containing the custom buildfile.
 </div>