diff --git a/runtime/doc/map.txt b/runtime/doc/map.txt
index 2efeb3b..18763f4 100644
--- a/runtime/doc/map.txt
+++ b/runtime/doc/map.txt
@@ -1272,6 +1272,7 @@
 However, by specifying one or the other of the following attributes, argument
 completion can be enabled:
 
+	-complete=arglist	file names in argument list
 	-complete=augroup	autocmd groups
 	-complete=buffer	buffer names
 	-complete=behave	:behave suboptions