diff --git a/test2.txt b/test2.txt
index 91705c067..bd7221899 100644
--- a/test2.txt
+++ b/test2.txt
@@ -1 +1,12 @@
 openstack
+sandbox
+=======
+
+This is a sandbox so that lovely developers can test the tools
+and processes used for OpenStack development.
+For detail, see the chapter "`Learn the Gerrit Workflow in the
+Sandbox <https://docs.openstack.org/infra/manual/sandbox.html>`_"
+in Infrastructure User Manual.
+
+Developer's Guide:
+https://docs.openstack.org/infra/manual/developers.html