diff --git a/Fixing-and-Extending-ComicPress.textile b/Fixing-and-Extending-ComicPress.textile
index 3910b7b..267c55b 100644
--- a/Fixing-and-Extending-ComicPress.textile
+++ b/Fixing-and-Extending-ComicPress.textile
@@ -10,7 +10,7 @@ Unless you already have the code written, <em>don't do development on your live
 </ul>
 </notextile>
 
-Also, in your local PHP installation, get "XDebug":http://www.xdebug.org/ working. Its error messages are much more useful than the standard PHP ones, and "var_dump":http://us.php.net/manual/en/function.var-dump.php output looks nicer, too.
+Also, in your local PHP installation, get "XDebug":http://www.xdebug.org/ working. Its error messages are much more useful than the standard PHP ones, and "var_dump":http://us.php.net/manual/en/function.var-dump.php output looks nicer with it, too.
 
 h2. functions.php
 
@@ -27,6 +27,7 @@ Fixing problems in ComicPress and WordPress gives you a good opportunity to lear
 * Learn to use "Firebug":http://www.getfirebug.com/ to diagnose display, tag, and network problems.
 ** And, if you've got the skills, use "FirePHP":http://www.firephp.org/, too.
 * Look up what the WordPress function that you're trying to use actually does on one of the many PHPXref sites that have the WordPress code all processed. I recommend "http://phpxref.com/xref/wordpress/":http://phpxref.com/xref/wordpress/
+* If you really want to be thorough, set up unit tests for your new functionality using "PHPUnit":http://www.phpunit.de/ and "MockPress":https://github.com/johnbintz/mockpress/tree (or set up tests for an existing function!)
 
 h2. Producing a patch