diff --git a/includes/path.inc b/includes/path.inc
index aa6ae9d4725eb59f2bd1cb8ba9cae1950284d2c8..df168c5a44fab58e1b1a3075614797fe875c2161 100644
--- a/includes/path.inc
+++ b/includes/path.inc
@@ -153,7 +153,7 @@ function drupal_get_normal_path($path, $path_language = '') {
  *   (forward-slash), and where the first component has an index of 0 (zero).
  *
  * @return
- *   The component specified by $index, or FALSE if the specified component was
+ *   The component specified by $index, or NULL if the specified component was
  *   not found.
  */
 function arg($index = NULL, $path = NULL) {