diff --git a/tox.ini b/tox.ini
index dbd21b0e..82b3e1f2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -40,7 +40,8 @@ commands = oslo_debug_helper {posargs}
 # D102: Missing docstring in public method
 # D103: Missing docstring in public function
 # D104: Missing docstring in public package
-ignore = D100,D101,D102,D103,D104
+# D203: 1 blank line required before class docstring (deprecated in pep257)
+ignore = D100,D101,D102,D103,D104,D203
 show-source = True
 exclude = .venv,.tox,dist,doc,*egg,build,*openstack/common*