diff --git a/runtime/doc/help.txt b/runtime/doc/help.txt
index f339dad..13d6c8a 100644
--- a/runtime/doc/help.txt
+++ b/runtime/doc/help.txt
@@ -136,6 +136,7 @@
 |diff.txt|	working with two to eight versions of the same file
 |autocmd.txt|	automatically executing commands on an event
 |eval.txt|	expression evaluation, conditional commands
+|builtin.txt|	builtin functions
 |channel.txt|	Jobs, Channels, inter-process communication
 |fold.txt|	hide (fold) ranges of lines