from index.php:

// Show the project blurb if the project manager defined one
if ($project_prefs['project_is_active'] == '1'
    && ($project_prefs['others_view'] == '1' OR @$permissions['view_tasks'] == '1')
    && !empty($project_prefs['intro_message'])
    && ($do == 'details' OR $do == 'index' OR $do == 'newtask' OR $do == 'reports' OR $do == 'depends')
    OR (isset($_GET['project']) && $_GET['project'] == '0'))
{
   $intro_message = Markdown(stripslashes($project_prefs['intro_message']));
   echo '<div id="intromessage">' . $intro_message . '</div>';
}