diff --git a/Makefile b/Makefile
index 09b40ca..5f3b62a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,11 @@
-.PHONY: clean-pyc clean-build docs clean
+.PHONY: help clean clean-build clean-pyc clean-test test docs
 
 help:
 	@echo "clean - remove all build, test, coverage and Python artifacts"
 	@echo "clean-build - remove build artifacts"
 	@echo "clean-pyc - remove Python file artifacts"
-	@echo "clean-test - remove test and coverage artifacts"
-	@echo "test - run tests on every Python version with tox"
+	@echo "clean-test - remove test, coverage and formatting artifacts"
+	@echo "test - run tests with tox and format with ruff"
 	@echo "docs - generate Sphinx HTML documentation, including API docs"
 
 clean: clean-build clean-pyc clean-test
@@ -15,7 +15,9 @@ clean-build:
 	rm -fr dist/
 	rm -fr .eggs/
 	find . -name '*.egg-info' -exec rm -fr {} +
-	find . -name '*.egg' -exec rm -f {} +
+	# Directory .tox/, if it exists, contains subdirectories ending with
+	# "egg", so we need to exclude it from the search.
+	find . -name '*.egg' -prune -name ".tox" -exec rm -f {} +
 
 clean-pyc:
 	find . -name '*.pyc' -exec rm -f {} +
@@ -27,6 +29,8 @@ clean-test:
 	rm -fr .tox/
 	rm -f .coverage
 	rm -fr htmlcov/
+	rm -fr .pytest_cache/
+	rm -fr .ruff_cache/
 
 test:
 	tox