diff --git a/sites/__init__.py b/sites/__init__.py
index b4d8572..ef72f4e 100644
--- a/sites/__init__.py
+++ b/sites/__init__.py
@@ -27,6 +27,7 @@ class Image:
     contents = attr.ib()
     content_type = attr.ib()
 
+
 @attr.s
 class Chapter:
     title = attr.ib()
@@ -34,6 +35,7 @@ class Chapter:
     date = attr.ib(default=False)
     images = attr.ib(default=attr.Factory(list))
 
+
 @attr.s
 class Section:
     title = attr.ib()