diff --git a/Makefile b/Makefile
index 455bab8..1adec1f 100644
--- a/Makefile
+++ b/Makefile
@@ -43,7 +43,7 @@ osx.o: osx.c xconf.h luacompat.h osx.h osx_dir.h
 $(lib): $(o) $(_o)
 	$(LD) $(LIBFLAG) -o $@ $(_ldflags) $(LDFLAGS) $(o) $(_o)
 
-doc/index.html: config.ld osx.c
+doc/index.html: README.md config.ld osx.c
 	$(LDOC) .
 
 doc: doc/index.html