Update runtime files
diff --git a/runtime/indent/yacc.vim b/runtime/indent/yacc.vim
index 01ad4fc..253ccc5 100644
--- a/runtime/indent/yacc.vim
+++ b/runtime/indent/yacc.vim
@@ -1,7 +1,8 @@
" Vim indent file
-" Language: YACC input file
-" Previous Maintainer: Nikolai Weibull <now@bitwi.se>
-" Latest Revision: 2006-12-20
+" Language: YACC input file
+" Maintainer: Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer: Nikolai Weibull <now@bitwi.se>
+" Last Change: 2022 April 25
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
@@ -14,6 +15,8 @@
setlocal indentkeys=!^F,o,O
setlocal nosmartindent
+let b:undo_indent = "setl inde< indk< si<"
+
" Only define the function once.
if exists("*GetYaccIndent")
finish