diff --git a/tox.ini b/tox.ini
index 304240e..133ac60 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,4 +20,4 @@ commands =
 
 [flake8]
 max-line-length = 88
-extend-ignore = E203
+extend-ignore = E203,E501