diff --git a/runtime/ftplugin/gomod.vim b/runtime/ftplugin/gomod.vim
new file mode 100644
index 0000000..0d5d9ba
--- /dev/null
+++ b/runtime/ftplugin/gomod.vim
@@ -0,0 +1,14 @@
+" Vim filetype plugin file
+" Language:    go module file
+" Maintainer:  YU YUK KUEN <yukkuen.yu719@gmail.com>
+" Last Change: 2024-06-21
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal formatoptions-=t formatoptions-=c
+setlocal commentstring=//\ %s
+
+let b:undo_ftplugin = 'setl fo< cms<'