diff --git a/config.org b/config.org
index b9b1613..4fa48ae 100644
--- a/config.org
+++ b/config.org
@@ -515,14 +515,26 @@ Exclude some dirs from spamming recentf
 
 
 * undo
+https://github.com/casouri/vundo
+replaced undo-tree, might be better for performance.
+Basic usage:
+<Left>/l, <rRight>/f, <Up>/p, <Down>/n for navigation
+m, u to (un)mark a state, d to show diff between a marked state and the current selection.
+
 #+BEGIN_SRC emacs-lisp
-(use-package undo-tree
+(use-package vundo
   :ensure t
-  :diminish undo-tree-mode
-  :init
-  (global-undo-tree-mode 1)
+  :bind ("C-x u" . vundo)
   :custom
-  (undo-tree-auto-save-history nil))
+  (vundo-glyph-alist vundo-unicode-symbols)
+)
+;; (use-package undo-tree
+;;   :ensure t
+;;   :diminish undo-tree-mode
+;;   :init
+;;   (global-undo-tree-mode 1)
+;;   :custom
+;;   (undo-tree-auto-save-history nil))
 #+END_SRC
 
 * COMMENT ace-window (now avy)