diff --git a/MANIFEST.in b/MANIFEST.in
index b5ef32ad..9f2e5feb 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -4,6 +4,7 @@ include *.rst
 recursive-include ryu *.xsd
 graft doc
 graft etc
+graft tools
 recursive-exclude doc/build *
 global-exclude *~
 global-exclude *.pyc