Update runtime files
diff --git a/runtime/indent/chaiscript.vim b/runtime/indent/chaiscript.vim
index 445281c..b7a3fe5 100644
--- a/runtime/indent/chaiscript.vim
+++ b/runtime/indent/chaiscript.vim
@@ -1,6 +1,7 @@
" Vim indent file
" Language: ChaiScript
" Maintainer: Jason Turner <lefticus 'at' gmail com>
+" Last Change: 2022 Apr 06
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
@@ -11,6 +12,8 @@
setlocal indentexpr=GetChaiScriptIndent()
setlocal autoindent
+let b:undo_indent = "setl ai< inde<"
+
" Only define the function once.
if exists("*GetChaiScriptIndent")
finish