diff --git a/chalice_spec/docs.py b/chalice_spec/docs.py
index 9055adb..7b455ca 100644
--- a/chalice_spec/docs.py
+++ b/chalice_spec/docs.py
@@ -16,7 +16,13 @@ class Response:
     and an optional description.
     """
 
-    def __init__(self, model: type, code: int = 200, description: str = "Success", content_type: str = DEFAULT_CONTENT_TYPE):
+    def __init__(
+            self,
+            model: type,
+            code: int = 200,
+            description: str = "Success",
+            content_type: str = DEFAULT_CONTENT_TYPE
+    ):
         self.model = model
         self.code = code
         self.description = description
@@ -64,7 +70,9 @@ def _populate_response(self, response: Union[Response, type]):
             self.responses = {response.code: {DEFAULT_CONTENT_TYPE: response}}
         else:
             # If not, we will use sensible defaults
-            self.responses = {DEFAULT_CODE: {DEFAULT_CONTENT_TYPE: Response(model=response)}}
+            self.responses = {
+                DEFAULT_CODE: {DEFAULT_CONTENT_TYPE: Response(model=response)}
+            }
 
     def _populate_responses(self, responses: List[Response]):
         self.responses = {}
@@ -72,7 +80,9 @@ def _populate_responses(self, responses: List[Response]):
             if response.code not in self.responses:
                 self.responses[response.code] = {}
             if response.content_type in self.responses[response.code]:
-                raise TypeError(f"Multiple responses defined for {response.code} — {response.content_type}")
+                raise TypeError(
+                    f"Multiple responses defined for {response.code} — {response.content_type}"
+                )
             self.responses[response.code][response.content_type] = response
 
 
diff --git a/tests/test_chalice.py b/tests/test_chalice.py
index 33edcdd..358a6a5 100644
--- a/tests/test_chalice.py
+++ b/tests/test_chalice.py
@@ -432,7 +432,13 @@ def test_content_types():
         "/posts",
         methods=["POST"],
         content_types=["multipart/form-data"],
-        docs=Docs(request=TestSchema, responses=[Resp(model=AnotherSchema, content_type="application/json"), Resp(model=AnotherSchema, content_type="application/xml")]),
+        docs=Docs(
+            request=TestSchema,
+            responses=[
+                Resp(model=AnotherSchema, content_type="application/json"),
+                Resp(model=AnotherSchema, content_type="application/xml")
+            ],
+        ),
     )
     def get_post():
         pass