diff --git a/src/drc/datamodel/migrations/0064_bestandsdeel_lock.py b/src/drc/datamodel/migrations/0064_bestandsdeel_lock.py
index eee71a02..f10a4405 100644
--- a/src/drc/datamodel/migrations/0064_bestandsdeel_lock.py
+++ b/src/drc/datamodel/migrations/0064_bestandsdeel_lock.py
@@ -6,13 +6,18 @@
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('datamodel', '0063_enkelvoudiginformatieobject_trefwoorden'),
+        ("datamodel", "0063_enkelvoudiginformatieobject_trefwoorden"),
     ]
 
     operations = [
         migrations.AddField(
-            model_name='bestandsdeel',
-            name='lock',
-            field=models.CharField(blank=True, help_text='Hash string, which represents id of the lock of related informatieobject', max_length=255, null=True),
+            model_name="bestandsdeel",
+            name="lock",
+            field=models.CharField(
+                blank=True,
+                help_text="Hash string, which represents id of the lock of related informatieobject",
+                max_length=255,
+                null=True,
+            ),
         ),
     ]
diff --git a/src/drc/datamodel/models/bestandsdeel.py b/src/drc/datamodel/models/bestandsdeel.py
index 4c36cb19..64a1bcff 100644
--- a/src/drc/datamodel/models/bestandsdeel.py
+++ b/src/drc/datamodel/models/bestandsdeel.py
@@ -32,7 +32,9 @@ class BestandsDeel(models.Model):
         max_length=255,
         null=True,
         blank=True,
-        help_text=_("Hash string, which represents id of the lock of related informatieobject"),
+        help_text=_(
+            "Hash string, which represents id of the lock of related informatieobject"
+        ),
     )
 
     class Meta: