diff --git a/mongoengine/queryset/base.py b/mongoengine/queryset/base.py
index bdc4855f4..75fab34de 100644
--- a/mongoengine/queryset/base.py
+++ b/mongoengine/queryset/base.py
@@ -634,7 +634,14 @@ def upsert_one(self, write_concern=None, read_concern=None, **update):
             document = self._document.objects.with_id(atomic_update.upserted_id)
         return document
 
-    def update_one(self, upsert=False, write_concern=None, full_result=False, array_filters=None, **update):
+    def update_one(
+        self,
+        upsert=False,
+        write_concern=None,
+        full_result=False,
+        array_filters=None,
+        **update,
+    ):
         """Perform an atomic update on the fields of the first document
         matched by the query.
 
@@ -662,9 +669,13 @@ def update_one(self, upsert=False, write_concern=None, full_result=False, array_
         )
 
     def modify(
-        self, upsert=False, full_response=False, remove=False, new=False,
-            array_filters=None,
-            **update
+        self,
+        upsert=False,
+        full_response=False,
+        remove=False,
+        new=False,
+        array_filters=None,
+        **update,
     ):
         """Update and return the updated document.