diff --git a/tests/conftest.py b/tests/conftest.py
index c4ce540..cca39cb 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -131,6 +131,7 @@ def open(self, *args, **kwargs):
 
 @pytest.fixture(scope='session')
 def celery_config():
+    """Celery worker config."""
     return {
         'result_backend': 'rpc',
         'task_always_eager': True