diff --git a/runtime/doc/help.txt b/runtime/doc/help.txt
index fc4816a6c8..a81d32831b 100644
--- a/runtime/doc/help.txt
+++ b/runtime/doc/help.txt
@@ -154,6 +154,7 @@ GUI ~
 Interfaces ~
 |if_cscop.txt|	using Cscope with Vim
 |if_pyth.txt|	Python interface
+|if_ruby.txt|	Ruby interface
 |debugger.txt|	Interface with a debugger
 |sign.txt|	debugging signs