diff --git a/tox.ini b/tox.ini
index 8187a2c1..190ae959 100644
--- a/tox.ini
+++ b/tox.ini
@@ -37,6 +37,7 @@ commands =
 
 [testenv:flake8]
 commands =
+    # mypy config is in own file: `.flake8`
     poetry run flake8 cyclonedx/ tests/ typings/ examples/ tools/
 
 [testenv:bandit]