diff --git a/core/modules/menu/menu.install b/core/modules/menu/menu.install
index 2fee65e..8c0c9fc 100644
--- a/core/modules/menu/menu.install
+++ b/core/modules/menu/menu.install
@@ -14,6 +14,7 @@ function menu_install() {
   // Add a link for each custom menu.
   \Drupal::service('router.builder')->rebuild();
   menu_router_rebuild();
+  menu_default_links_rebuild();
   $system_link = entity_load_multiple_by_properties('menu_link', array('link_path' => 'admin/structure/menu', 'module' => 'system'));
   $system_link = reset($system_link);
 
diff --git a/core/modules/system/system.api.php b/core/modules/system/system.api.php
index 27bb2eb..cccf2be 100644
--- a/core/modules/system/system.api.php
+++ b/core/modules/system/system.api.php
@@ -491,6 +491,50 @@ function hook_menu_get_item_alter(&$router_item, $path, $original_map) {
 /**
  * Define links for menus.
  *
+ * @return
+ *   An array of default menu links. Each link has a key corresponding to a
+ *   unique machine name. The corresponding array value is an
+ *   associative array that may contain the following key-value pairs:
+ *   - "link_title": Required. The untranslated title of the menu item.
+ *     with path component substitution as described above.
+ *   - "description": The untranslated description of the link.
+ *   - "route_name": Required. The untranslated title of the menu item.
+ *   - "route_parameters": Required. The untranslated title of the menu item.
+ *   - "link_path": Optional. Generally used for external links.
+ *   - "parent": Optional. The machine name of a link to define hierarchy.
+ *   - "weight": An integer that determines the relative position of items in
+ *     the menu; higher-weighted items sink. Defaults to 0. Menu items with the
+ *     same weight are ordered alphabetically.
+ *   - "menu_name": Optional. Set this to a custom menu if you don't want your
+ *     item to be placed in the default Tools menu.
+ *   - "expanded": Optional. If set to TRUE, and if a menu link is provided for
+ *     this menu item (as a result of other properties), then the menu link is
+ *     always expanded, equivalent to its 'always expanded' checkbox being set
+ *     in the UI.
+ *   - "type": A bitmask of flags describing properties of the menu item.
+ *     Many shortcut bitmasks are provided as constants in menu.inc:
+ *     - MENU_NORMAL_ITEM: Normal menu items show up in the menu tree and can be
+ *       moved/hidden by the administrator.
+ *     - MENU_SUGGESTED_ITEM: Modules may "suggest" menu items that the
+ *       administrator may enable.
+ *     If the "type" element is omitted, MENU_NORMAL_ITEM is assumed.
+ *   - "options": An array of options to be passed to l() when generating a link
+ *     from this menu item.
+ */
+function hook_default_menu_links() {
+
+}
+
+/**
+ * Alter links for menus.
+ */
+function hook_default_menu_links_alter(&$links) {
+
+}
+
+/**
+ * Define links for menus.
+ *
  * @section sec_menu_link Creating Menu Items
  * Menu item example of type MENU_NORMAL_ITEM:
  * @code