diff --git a/core/includes/menu.inc b/core/includes/menu.inc
index 7fb462f..838b32a 100644
--- a/core/includes/menu.inc
+++ b/core/includes/menu.inc
@@ -896,7 +896,7 @@ function _menu_tree_data(&$links, $parents, $depth) {
     $next = end($links);
     // Check whether the next link is the first in a new sub-tree.
     if ($next && $next['depth'] > $depth) {
-      // Recursively call _buildBookOutlineRecursive to build the sub-tree.
+      // Recursively call _menu_tree_data to build the sub-tree.
       $tree[$item['mlid']]['below'] = _menu_tree_data($links, $parents, $next['depth']);
       // Fetch next link after filling the sub-tree.
       $next = end($links);