diff --git a/runtime/doc/Makefile b/runtime/doc/Makefile
index a8a6410..7068943 100644
--- a/runtime/doc/Makefile
+++ b/runtime/doc/Makefile
@@ -168,6 +168,7 @@
 	gui_x11.html \
 	hangulin.html \
 	hebrew.html \
+	helphelp.html \
 	howto.html \
 	if_cscop.html \
 	if_mzsch.html \