WP-Grins and quicktag.php problem

I’m trying to install the wp-grins plugin and one of the steps is:
1. The easy way (if you are already using Quicktags, if no – why aren’t you? they’re great!) is to add the call in wp-admin/quicktags.php. Add this at the end of the file:
<?php wp_grins(); ?>
Well, the problem is that my quicktags.php file is just:
<script src=”quicktags.js” language=”JavaScript” type=”text/javascript”></script>
<script language=”JavaScript” type=”text/javascript”>edToolbar();</script>
It’s a really short file. Is it supposed to be like that?