diff --git a/openflexure_microscope/api/app.py b/openflexure_microscope/api/app.py
index 205e9333..c27bc90d 100644
--- a/openflexure_microscope/api/app.py
+++ b/openflexure_microscope/api/app.py
@@ -106,7 +106,7 @@ app, labthing = create_app(
 cors: CORS = CORS(app)
 
 # Enable correct handling of Marshmallow/Webargs validation errors
-# Return validation errors as JSON 
+# Return validation errors as JSON
 # (see  https://webargs.readthedocs.io/en/latest/framework_support.html)
 @app.errorhandler(422)
 @app.errorhandler(400)
@@ -118,6 +118,7 @@ def handle_error(err):
     else:
         return jsonify({"errors": messages}), err.code
 
+
 # Use custom JSON encoder
 labthing.json_encoder = JSONEncoder
 app.json_encoder = JSONEncoder
diff --git a/openflexure_microscope/api/default_extensions/scan.py b/openflexure_microscope/api/default_extensions/scan.py
index e05f7352..782ad8f4 100644
--- a/openflexure_microscope/api/default_extensions/scan.py
+++ b/openflexure_microscope/api/default_extensions/scan.py
@@ -362,7 +362,11 @@ class ScanExtension(BaseExtension):
 
 class TileScanArgs(FullCaptureArgs):
     namemode = fields.String(missing="coordinates", example="coordinates")
-    grid = fields.List(fields.Integer(validate=marshmallow.validate.Range(min=1)), missing=[3, 3, 3], example=[3, 3, 3], )
+    grid = fields.List(
+        fields.Integer(validate=marshmallow.validate.Range(min=1)),
+        missing=[3, 3, 3],
+        example=[3, 3, 3],
+    )
     style = fields.String(missing="raster")
     autofocus_dz = fields.Integer(missing=50)
     fast_autofocus = fields.Boolean(missing=False)