diff --git a/runtime/ftplugin/c3.vim b/runtime/ftplugin/c3.vim
new file mode 100644
index 0000000..6db665a
--- /dev/null
+++ b/runtime/ftplugin/c3.vim
@@ -0,0 +1,14 @@
+" Vim filetype plugin
+" Language:	C3
+" Maintainer:	Turiiya <34311583+ttytm@users.noreply.github.com>
+" Last Change:	2024 Nov 24
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setl comments=sO:*\ -,mO:*\ \ ,exO:*/,s1:/*,mb:*,ex:*/,:///,://
+setl commentstring=//\ %s
+
+let b:undo_ftplugin = 'setl com< cms<'