1 files changed, 4 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index 74b1d8a..43b0729 100644
--- a/tox.ini
+++ b/tox.ini
@@ -50,6 +50,10 @@ commands =
 [flake8]
 ignore =
 exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build,tools
+# [H106] Don’t put vim configuration in source files.
+# [H203] Use assertIs(Not)None to check for None.
+# [H904] Delay string interpolations at logging calls.
+enable-extensions=H106,H203,H904
 
 [hacking]
 import_exceptions = testtools.matchers