diff --git a/runtime/indent/ld.vim b/runtime/indent/ld.vim
index a72a3a9..ddf003e 100644
--- a/runtime/indent/ld.vim
+++ b/runtime/indent/ld.vim
@@ -1,7 +1,8 @@
 " Vim indent file
-" Language:             ld(1) script
-" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2006-12-20
+" Language:		ld(1) script
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
+" Last Change:		24 Sep 2021
 
 if exists("b:did_indent")
   finish
@@ -12,6 +13,8 @@
 setlocal indentkeys=0{,0},!^F,o,O
 setlocal nosmartindent
 
+let b:undo_indent = "setl inde< indk< si<"
+
 if exists("*GetLDIndent")
   finish
 endif