Forum Description in List of Topics page

Hi,

I have several forums with description. Descriptions are shown in Forums list page. I would like to show the description of each forum in the list of forum topics page. I understand I have to print the following code in forum-topic-list.tpl.php:

<?php if ($forum->description): ?>
            <div class="description"><?php print $forum->description; ?></div>
          <?php endif; ?>

But the descriptions are not showing up. Do I have to modify template.php file? If yes can I please have the code and advice?

Thank you.