diff --git a/public/lib/classes/output/requirements/page_requirements_manager.php b/public/lib/classes/output/requirements/page_requirements_manager.php
index 9771504f43c..71052f7ef6b 100644
--- a/public/lib/classes/output/requirements/page_requirements_manager.php
+++ b/public/lib/classes/output/requirements/page_requirements_manager.php
@@ -990,7 +990,7 @@ class page_requirements_manager {
      *
      * @param string $stylesheet The path to the .css file, relative to $CFG->wwwroot.
      *   For example:
-     *      $PAGE->requires->css('mod/data/css.php?d='.$data->id);
+     *      $PAGE->requires->css('/mod/data/css.php?d='.$data->id);
      */
     public function css($stylesheet) {
         global $CFG;