diff --git a/tren.rst b/tren.rst
index 4a67c92..c4127aa 100644
--- a/tren.rst
+++ b/tren.rst
@@ -2984,9 +2984,26 @@
   spaces in a filename with underscores, we have to quote the space
   to preserve it as an argument to be passed to **tren**::
 
-    # 'tren' include to get rid of spaces in filenames
+    # nospace: 'tren' include to get rid of spaces in filenames
     -i: -r' '=_  -r_-_=-  -i0 
 
+- Watch out for situations where an include file changes default or
+  desired behavior.  In the example above,  the ``-i:`` is used to
+  force replacement of *all* instances of spaces.  The ``-i0`` at
+  the end of the include resets **tren** to the default behavior
+  of only replacing the first instance of a matching old string.
+  That's fine if the include statement appears on the command line
+  in a place where the default behavior was in force.  But look
+  what happens in a situation like this::
+
+    tren.py -i3 -rx=y -Inospace -ra=b ....
+
+  Prior to the include file being read, **tren** has been told to
+  replace the 4th instance of a matching string.  After the
+  ``nospace`` include file has been read, this gets reset to replace
+  the 1st instance of a matching old string.  Make sure that's what
+  you want for the ``-ra=b`` renaming request.
+
 - Most shells don't care if you leave a space between an option
   and its argument. It's a really good idea to do so as a matter
   of habit, especially when dealing with a complex command line
@@ -3082,7 +3099,7 @@
 
 ::
 
-  $Id: tren.rst,v 1.199 2010/11/17 19:41:46 tundra Exp $
+  $Id: tren.rst,v 1.200 2010/11/17 19:52:56 tundra Exp $
 
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