diff --git a/tox.ini b/tox.ini
index 7aa1bbf..c043596 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,3 +1,7 @@
+[flake8]
+max-line-length = 100
+exclude = .tox,docs/modeltranslation/conf.py
+
 [tox]
 distribute = False
 envlist =