diff --git a/graphene_django/converter.py b/graphene_django/converter.py
index eabb680..8010e3b 100644
--- a/graphene_django/converter.py
+++ b/graphene_django/converter.py
@@ -205,7 +205,9 @@ def convert_field_to_boolean(field, registry=None):
 
 @convert_django_field.register(models.DecimalField)
 def convert_field_to_decimal(field, registry=None):
-    return Decimal(description=get_django_field_description(field), required=not field.null)
+    return Decimal(
+        description=get_django_field_description(field), required=not field.null
+    )
 
 
 @convert_django_field.register(models.FloatField)