diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 0a1c3b1..e6747ad 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -4270,6 +4270,7 @@
 		file		file and directory names
 		file_in_path	file and directory names in |'path'|
 		filetype	filetype names |'filetype'|
+		filetypecmd	|:filetype| suboptions
 		function	function name
 		help		help subjects
 		highlight	highlight groups