diff --git a/tox.ini b/tox.ini
index 4d644d9..725fb0f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -25,4 +25,4 @@ commands =
 
 [flake8]
 max-line-length = 88
-extend-ignore = E203
+extend-ignore = E203,E501