diff --git a/tren.rst b/tren.rst
index d33d984..4a67c92 100644
--- a/tren.rst
+++ b/tren.rst
@@ -2978,6 +2978,15 @@
   **tren** to see, whether in a renaming request, an alphabet
   definition, or some part of a sequence renaming token.
 
+- Quoting can also be tricky in include files.  Remember that the
+  contents of the include file are presented to **tren** as if they
+  had been entered on the command line.  For example, to replace
+  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
+    -i: -r' '=_  -r_-_=-  -i0 
+
 - 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
@@ -3073,7 +3082,7 @@
 
 ::
 
-  $Id: tren.rst,v 1.198 2010/11/16 20:59:31 tundra Exp $
+  $Id: tren.rst,v 1.199 2010/11/17 19:41:46 tundra Exp $
 
 You can find the latest version of this program at: