diff --git a/configuration.org b/configuration.org
index e74d112..34b3370 100644
--- a/configuration.org
+++ b/configuration.org
@@ -1794,7 +1794,9 @@ INFO plist."
 ** ~undo-tree~
 
 #+begin_src emacs-lisp
-(use-package undo-tree)
+(use-package undo-tree
+  :config
+  (global-undo-tree-mode))
 #+end_src
 
 ** ~ciel~ to mimic ViM’s ~ci~ functionality