diff --git a/runtime/ftplugin/xkb.vim b/runtime/ftplugin/xkb.vim
new file mode 100644
index 0000000000..73ca32e983
--- /dev/null
+++ b/runtime/ftplugin/xkb.vim
@@ -0,0 +1,14 @@
+" Vim filetype plugin
+" Language:    xkb (X keyboard extension)
+" Maintainer:  The Vim Project <https://github.com/vim/vim>
+" Last Change: 2026 Mar 01
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setl comments=://
+setl commentstring=//\ %s
+
+let b:undo_ftplugin = 'setl com< cms<'