Update runtime files
diff --git a/runtime/indent/make.vim b/runtime/indent/make.vim
index 4483efd..76c8f83 100644
--- a/runtime/indent/make.vim
+++ b/runtime/indent/make.vim
@@ -1,7 +1,8 @@
" Vim indent file
-" Language: Makefile
-" Previous Maintainer: Nikolai Weibull <now@bitwi.se>
-" Latest Revision: 2007-05-07
+" Language: Makefile
+" 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=!^F,o,O,<:>,=else,=endif
setlocal nosmartindent
+let b:undo_indent = "setl ai< inde< indk<"
+
if exists("*GetMakeIndent")
finish
endif