diff --git a/tox.ini b/tox.ini
index e0ca1c3e2..7b5a64a15 100644
--- a/tox.ini
+++ b/tox.ini
@@ -74,8 +74,11 @@ commands = pylint -j0 -E --rcfile=.pylintrc -e W,E tobiko
 [flake8]
 # 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
+# H204: Use assert(Not)Equal to check for equality
+# H205: Use assert(Greater|Less)(Equal) for comparison
+# H904: Delay string interpolations at logging calls.
+enable-extensions = H106,H203,H204,H205,H904
+
 show-source = true
 exclude = ./.*,build,dist,doc,*egg*,releasenotes
 import-order-style = pep8