diff --git a/runtime/ftplugin/mbsync.vim b/runtime/ftplugin/mbsync.vim
new file mode 100644
index 0000000..f2d13ef
--- /dev/null
+++ b/runtime/ftplugin/mbsync.vim
@@ -0,0 +1,13 @@
+" Vim filetype plugin file
+" Language:		mbsync configuration file
+" Maintainer:		Pierrick Guillaume <pguillaume@fymyte.com>
+" Last Change:		2025 Apr 13
+
+if (exists('b:did_ftplugin'))
+  finish
+endif
+let b:did_ftplugin = 1
+
+let b:undo_ftplugin = "setlocal commentstring<"
+
+setlocal commentstring=#\ %s