diff --git a/plugin.php src/wp-admin/includes/plugin.php
index 7e660f0..995fe58 100755
--- a/plugin.php
+++ src/wp-admin/includes/plugin.php
@@ -1770,8 +1770,10 @@ function get_plugin_page_hook( $plugin_page, $parent_page ) {
 
 /**
  * @global array $admin_page_hooks
- * @param string $plugin_page
- * @param string $parent_page
+ * @param string $plugin_page. Name of the page generated by plugin. Required.
+ * @param string $parent_page. Required. Name of the parent page of $plugin_page. Required.
+ *
+ * @return string. Name of the plugin page hook.
  */
 function get_plugin_page_hookname( $plugin_page, $parent_page ) {
 	global $admin_page_hooks;
@@ -1802,6 +1804,8 @@ function get_plugin_page_hookname( $plugin_page, $parent_page ) {
  * @global array $_wp_submenu_nopriv
  * @global string $plugin_page
  * @global array $_registered_pages
+ *
+ * @return bool. Whether the current user can access admin pages.
  */
 function user_can_access_admin_page() {
 	global $pagenow, $menu, $submenu, $_wp_menu_nopriv, $_wp_submenu_nopriv,