diff --git a/doc/source/index.rst b/doc/source/index.rst
index 93fcc3a..b590380 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -98,6 +98,14 @@
 
    tempest_and_plugins_compatible_version_policy
 
+Stable Branch Testing Policy
+----------------------------
+
+.. toctree::
+   :maxdepth: 2
+
+   stable_branch_testing_policy
+
 Library
 -------
 
diff --git a/doc/source/stable_branch_testing_policy.rst b/doc/source/stable_branch_testing_policy.rst
new file mode 100644
index 0000000..02c5338
--- /dev/null
+++ b/doc/source/stable_branch_testing_policy.rst
@@ -0,0 +1,33 @@
+Stable Branch Testing Policy
+============================
+
+Tempest and its plugins need to support the stable branches
+as per :doc:`Stable Branch Support Policy </stable_branch_support_policy>`.
+
+Because of branchless model of Tempest and plugins, all the supported
+stable branches use the Tempest and plugins master version for their
+testing. That is done in devstack by using the `master branch
+<https://opendev.org/openstack/devstack/src/commit/c104afec7dd72edfd909847bee9c14eaf077a28b/stackrc#L314>`_
+for the Tempest installation. To make sure the master version of Tempest or
+plugins (for any changes or adding new tests) is compatible for all
+the supported stable branches testing, Tempest and its plugins need to
+add the stable branches job on the master gate. That way can test the stable
+branches against master code and can avoid breaking supported branches
+accidentally.
+
+Example:
+
+* `Stable jobs on Tempest master
+  <https://opendev.org/openstack/tempest/src/commit/e8f1876aa6772077f85f380677b30251c2454505/.zuul.yaml#L646-L651>`_.
+
+* `Stable job on neutron tempest plugins
+  <https://opendev.org/openstack/neutron-tempest-plugin/src/commit/4bc1b00213cf660648cad1916fe6497ac29b2e78/.zuul.yaml#L1427-L1428>`_
+
+Once any stable branch is moved to the `Extended Maintenance Phases`_
+and devstack start using the Tempest older version for that stable
+branch testing then we can remove that stable branch job from master
+gate.
+
+Example: https://review.opendev.org/#/c/722183/
+
+.. _Extended Maintenance Phases: https://docs.openstack.org/project-team-guide/stable-branches.html#extended-maintenance