diff --git a/README.md b/README.md
index 8655c83..4048248 100644
--- a/README.md
+++ b/README.md
@@ -31,3 +31,6 @@ Visit `localhost:3000` with web browser.
 Visit `localhost:3000` with web browser. Changes should load when you reload
 the page, without having to restart the server.
 
+## run tests
+
+    $ docker run --rm -t -v $PWD:/opt/app --entrypoint carton mojo_app exec -- prove -lv t