diff --git a/tox.ini b/tox.ini
index 8667399f0..6a598415c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,3 +1,16 @@
+# Run all tests:
+#   tox
+# Run all tests in one file in all test environments:
+#   tox -- tests/test_api.py
+# Run one test in all test environments:
+#   tox -- tests/test_api.py::test_api
+# Run all tests in one test environment:
+#   tox -e py39
+# Run all tests in one file in one test environment:
+#   tox -e py39 -- tests/test_api.py
+# Run one test in one test environment:
+#   tox -e py39 -- tests/test_api.py::test_api
+
 [flake8]
 exclude=connexion/__init__.py
 rst-roles=class,mod,obj
@@ -34,7 +47,7 @@ commands=
     poetry lock
     poetry install --all-extras --with tests
     poetry show
-    poetry run python -m pytest tests --cov connexion --cov-report term-missing
+    poetry run python -m pytest tests --cov connexion --cov-report term-missing {posargs}
     min: mv -f pyproject.toml.bak pyproject.toml
 
 [testenv:pre-commit]