// at showthread.php, add dynamic description from first post
	if ($mybb->settings['cur_file'] == 'showthread.php' && MAX_DESCRIPTION_LEN > 0)
	{
		// get first post
		$query = $db->query("SELECT message FROM ".TABLE_PREFIX."posts WHERE tid = '{$mybb->input[tid]}' ORDER BY pid ASC LIMIT 1");
		$row = $db->fetch_array($query);
		if ($row['message'] != "") {
			$description = seo_clean_description($row['message']);
			$meta_tag = "\r\n" . '<meta name="description" content="'. $description .'" />' . "\r\n";
			$meta_tag .= "\r\n" . '<meta name="keywords" content="'. $description .'" />' . "\r\n";
			$page = preg_replace('#<meta(.+?) />#', "\\0{$meta_tag}", $page);
		}
	}