diff --git a/ghc/docs/Makefile b/ghc/docs/Makefile
index cf8be1f57fcdcf1b33c89039ef7fd3482125ac5f..b1517f541513e2b7b91f12791407f2cd0c3f2e76 100644
--- a/ghc/docs/Makefile
+++ b/ghc/docs/Makefile
@@ -6,6 +6,6 @@ include $(TOP)/mk/boilerplate.mk
 #
 export WAYS=
 
-SUBDIRS = users_guide
+SUBDIRS = libraries users_guide
 
 include $(TOP)/mk/target.mk