diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index cf4ce5f5a27f9efe27565e02c54545a88cb4deca..066ce18704024f575f35a05e51f05d08c596b9b0 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -142,5 +142,6 @@ class LimitBlockingTypes(object):
 
 class EventContentFields(object):
     """Fields found in events' content, regardless of type."""
+
     # Labels for the event, cf https://github.com/matrix-org/matrix-doc/pull/2326
     Labels = "org.matrix.labels"
diff --git a/synapse/storage/data_stores/main/events.py b/synapse/storage/data_stores/main/events.py
index 42ffa9066a77657758c1037cac577378bf2dcb79..0480161056f43497ffbc73ae4909b9784b22d875 100644
--- a/synapse/storage/data_stores/main/events.py
+++ b/synapse/storage/data_stores/main/events.py
@@ -29,7 +29,7 @@ from prometheus_client import Counter, Histogram
 from twisted.internet import defer
 
 import synapse.metrics
-from synapse.api.constants import EventTypes, EventContentFields
+from synapse.api.constants import EventContentFields, EventTypes
 from synapse.api.errors import SynapseError
 from synapse.events import EventBase  # noqa: F401
 from synapse.events.snapshot import EventContext  # noqa: F401