diff --git a/tox.ini b/tox.ini
index 814d38eb6f..7ddd23ac8b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -157,6 +157,14 @@ ignore = H101,H202,H214,H216,H301,H306,H404,H405,H501,W503,W504,E402,E731,E741
 exclude = .venv,.tox,dist,*egg
 filename = *.py
 show-source = True
+# Optional, off-by-default checks:
+# H106: Don't put vim configuration in source files
+# H203: Use assertIs(Not)None to check for None
+# H204: Use assert(Not)Equal to check for equality.
+# H205: Use assert(Greater|Less)(Equal) for comparison.
+# H210: Require ‘autospec’, ‘spec’, or ‘spec_set’ in mock.patch/mock.patch.object calls
+# H904: Delay string interpolations at logging calls.
+enable-extensions = H106,H904
 
 [testenv:bindep]
 # Do not install any requirements. We want this to be fast and work even if