diff --git a/runtime/indent/treetop.vim b/runtime/indent/treetop.vim
index 42ec1c8..6c39c69 100644
--- a/runtime/indent/treetop.vim
+++ b/runtime/indent/treetop.vim
@@ -1,7 +1,8 @@
 " Vim indent file
-" Language:             Treetop
-" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2011-03-14
+" Language:		Treetop
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
+" Last Change:		2022 April 25
 
 if exists("b:did_indent")
   finish
@@ -12,6 +13,8 @@
 setlocal indentkeys=0{,0},!^F,o,O,=end
 setlocal nosmartindent
 
+let b:undo_indent = "setl inde< indk< si<"
+
 if exists("*GetTreetopIndent")
   finish
 endif