diff --git a/arkindex_worker/worker/classification.py b/arkindex_worker/worker/classification.py
index 54e098623a9efa2d9cdce38bd81545591e46a088..ee1e1b2da1f8712490a371442be698068cf3b51b 100644
--- a/arkindex_worker/worker/classification.py
+++ b/arkindex_worker/worker/classification.py
@@ -36,7 +36,6 @@ class ClassificationMixin(object):
         :param ml_class str: Name of the MLClass.
         :returns str: ID of the retrieved or created MLClass.
         """
- 
         if not self.classes.get(self.corpus_id):
             self.load_corpus_classes()
 
diff --git a/tests/test_elements_worker/test_entities.py b/tests/test_elements_worker/test_entities.py
index 41e53644834137a116f1248c60418a72421a30cb..84963d796675ff02a2090c3f99fdbe0c2eed7937 100644
--- a/tests/test_elements_worker/test_entities.py
+++ b/tests/test_elements_worker/test_entities.py
@@ -94,6 +94,7 @@ def test_create_entity_wrong_corpus(monkeypatch, mock_elements_worker):
     elt = Element({"id": "12341234-1234-1234-1234-123412341234"})
 
     # Triggering an error on metas param, not giving corpus should work since
+    # ARKINDEX_CORPUS_ID environment variable is set on mock_elements_worker
     with pytest.raises(AssertionError) as e:
         mock_elements_worker.create_entity(
             element=elt,