diff --git a/circle.yml b/circle.yml
index b19a6e6..1a743a9 100644
--- a/circle.yml
+++ b/circle.yml
@@ -6,3 +6,10 @@ machine:
 dependencies:
   override:
     - bash build.sh
+
+test:
+  pre:
+    - pip install flake8
+
+  override:
+    - flake8 ymd/ --ignore=E128,E501
diff --git a/ymd/main.py b/ymd/main.py
index 50b9332..b6e0436 100644
--- a/ymd/main.py
+++ b/ymd/main.py
@@ -22,6 +22,7 @@ def parse_item(item, h):
         return item
     return markdown.markdown(str(item))
 
+
 def output(item, f):
     item_type = type(item)
     if item_type is list:
@@ -48,4 +49,3 @@ with StringIO() as rendered:
     os.remove('test.html')
     with open('test.html', 'w') as f:
         f.write(soup.prettify())
-