diff --git a/core/includes/common.inc b/core/includes/common.inc
index 08ce2ab..310da74 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -651,16 +651,15 @@ function drupal_encode_path($path) {
  * @param $options
  *   An associative array of additional URL options to pass to url().
  * @param $http_response_code
- *   Valid values for an actual "goto" as per RFC 2616 section 10.3 are:
- *   - 301 Moved Permanently (the recommended value for most redirects)
- *   - 302 Found (default in Drupal and PHP, sometimes used for spamming search
- *         engines)
- *   - 303 See Other
- *   - 304 Not Modified
- *   - 305 Use Proxy
- *   - 307 Temporary Redirect (alternative to "503 Site Down for Maintenance")
- *   Note: Other values are defined by RFC 2616, but are rarely used and poorly
- *   supported.
+ *   The valid values are defined in @link http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3 RFC 2616 @endlink
+ *   and the @link http://tools.ietf.org/html/draft-reschke-http-status-308-07 draft for the new HTTP status codes @endlink:
+ *   - 301: Moved Permanently (the recommended value for most redirects)
+ *   - 302: Found (default in Drupal and PHP, sometimes used for spamming search
+ *          engines)
+ *   - 303: See Other
+ *   - 304: Not Modified
+ *   - 305: Use Proxy
+ *   - 307: Temporary Redirect
  *
  * @see drupal_get_destination()
  * @see url()