diff --git a/runtime/ftplugin/json5.vim b/runtime/ftplugin/json5.vim
new file mode 100644
index 0000000..2560857
--- /dev/null
+++ b/runtime/ftplugin/json5.vim
@@ -0,0 +1,28 @@
+" Vim filetype plugin file
+" Language:	JSON5
+" Maintainer:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:	2023 Oct 19
+
+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin = 1
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+setlocal comments=sO:*\ -,mO:*\ \ ,exO:*/,s1:/*,mb:*,ex:*/,://
+setlocal commentstring=//\ %s
+setlocal formatoptions-=t formatoptions+=croql
+
+let b:undo_ftplugin = "setl fo< com< cms<"
+
+if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
+  let b:browsefilter = "JSON5 Files (*.json5)\t*.json5\n" ..
+	\	       "JSON Files (*.json)\t*.json\n" ..
+	\	       "All Files (*.*)\t*.*\n"
+  let b:undo_ftplugin ..= " | unlet! b:browsefilter"
+endif
+
+let &cpo = s:cpo_save
+unlet s:cpo_save