diff --git a/runtime/ftplugin/elm.vim b/runtime/ftplugin/elm.vim
index 1e10346..8c2de19 100644
--- a/runtime/ftplugin/elm.vim
+++ b/runtime/ftplugin/elm.vim
@@ -1,7 +1,7 @@
 " Elm filetype plugin file
 " Language: Elm
 " Maintainer: Andreas Scharf <as@99n.de>
-" Latest Revision: 2020-05-29
+" Latest Revision: 2022-04-25
 
 if exists("b:did_ftplugin")
   finish
@@ -14,5 +14,7 @@
 setlocal comments=s1fl:{-,mb:\ ,ex:-},:--
 setlocal commentstring=--\ %s
 
+let b:undo_ftplugin = "setl com< cms<"
+
 let &cpo = s:cpo_save
 unlet s:cpo_save