No signatures!

I've only just noticed - signatures aren't displaying anywhere, this is due to; http://drupal.org/node/132442#signature

So I've changed my comment.tpl.php file;

<?php
// $Id: comment.tpl.php,v 1.1.2.1 2008/01/26 18:13:38 skiquel Exp $
?>  <div class="comment<?php if ($comment->status == COMMENT_NOT_PUBLISHED) print ' comment-unpublished'; ?>">
    <?php if ($picture) {
    print $picture;
  } ?>
<h3 class="title"><?php print $title; ?></h3><?php if ($new != '') { ?><span class="new"><?php print $new; ?></span><?php } ?>
    <div class="submitted"><?php print $submitted; ?></div>
    <div class="content"><?php print $content; ?></div>
    <?php if ($signature): ?>
      <div class="user-signature clear-block">
        <?php print $signature ?>
      </div>
    <?php endif; ?>
    <div class="links">&raquo; <?php print $links; ?></div>
  </div>

I'm not entirely sure how to 'rebuild' old comments, but it appears to show the signature fine when you reply to a comment which isn't displaying one. This is a bit confusing as I understood from the theme update page that they're supposed to be dynamic? You'd have thought that would have meant they'd be displayed without any rebuilding being required then? Dunno... Maybe more needs to be done?

Pobster