diff --git a/doc/source/overview.rst b/doc/source/overview.rst
index 9382d412..42330285 100644
--- a/doc/source/overview.rst
+++ b/doc/source/overview.rst
@@ -3,3 +3,42 @@ Overview
 ========
 
 .. include:: ../../README.rst
+
+
+`Tempest <https://docs.openstack.org/tempest/latest/>`_ is a testing
+framework consisting of a set of integration tests to test any deployed
+OpenStack cloud.
+
+
+os_tempest mission
+------------------
+
+To provide a re-usable ansible role which installs, configures and runs
+Tempest.
+
+
+Why?
+----
+
+The reason we have come up with this idea is because every OpenStack
+project uses playbooks and shell scripts to install, run and configure Tempest
+which are only slightly different but their purpose is the same.
+
+When every project uses its own way to use Tempest, it's really harder to
+cooperate (cross projects) together to solve any issues which may occur.
+
+That's where the re-usability steps in. By using the same role we can faster
+react to any issues which occurred in one project and may have an effect on
+another one.
+
+
+Advantages
+----------
+
+* maintenance of only one set of playbooks and scripts
+* heads-up for issues related to particular tests
+* bigger focus on development and maintenance of the one set of playbooks and
+  scripts
+* decreasing of time consumption needed to install, configure and run Tempest
+  for new OpenStack projects - no need to write their CI Tempest procedures
+  from scratch