diff --git a/Makefile b/Makefile
index 0daef30..af3b138 100644
--- a/Makefile
+++ b/Makefile
@@ -10,5 +10,8 @@ doc:
 
 clean:
 	(cd doc && $(MAKE) clean)
+	find -name __pycache__ | xargs rm -fr
+	find -name *.pyc | xargs rm -f
+	rm -f README.html
 
 .PHONY: test doc