diff --git a/tren.rst b/tren.rst
index 9b968a8..4d67221 100644
--- a/tren.rst
+++ b/tren.rst
@@ -65,6 +65,11 @@
 
   tren.py -opt -opt -- -this_file_starts_with_a_dash
 
+The list of items targeted for renaming must name directories or files
+that exist or be a wildcard that expands to existing directories or
+files.  If you specify a non-existent renaming target, ``tren`` will
+display an error and stop further processing.
+
 Most shells aren't too fussy about space between an option
 that takes an argument, and that argument::
 
@@ -199,6 +204,14 @@
        see how the internal tables of the program change as various
        options are parsed.
 
+       This option also shows each incremental change to a file name
+       as each renaming request specified on the command line is
+       applied.  This can be helful when figuring out a new/complex
+       renaming operation.   This is most easily used by invoking
+       the "quiet" and "test" modes::
+
+         tren.py -tqd -r... -r... file file...
+
   -f   Force renaming even if target file or directory name already
        exists.
 
@@ -2792,7 +2805,7 @@
 
 ::
 
-  $Id: tren.rst,v 1.189 2010/08/29 23:30:45 tundra Exp $
+  $Id: tren.rst,v 1.190 2010/09/07 19:39:08 tundra Exp $
 
 You can find the latest version of this program at: