diff --git a/patrole_tempest_plugin/config.py b/patrole_tempest_plugin/config.py
index 62337f7..63f0a8a 100644
--- a/patrole_tempest_plugin/config.py
+++ b/patrole_tempest_plugin/config.py
@@ -96,6 +96,11 @@
 * add_image
 
 allowed_role = the ``oslo.policy`` role that is allowed to perform the API.
+"""),
+    cfg.BoolOpt('validate_deprecated_rules', default=True,
+                help="""Some of the policy rules have deprecated version,
+Patrole should be able to run check against default and deprecated rules,
+otherwise the result of the tests may not be correct.
 """)
 ]