diff --git a/README.md b/README.md
index d284ea7..da8fecc 100644
--- a/README.md
+++ b/README.md
@@ -93,6 +93,8 @@ Additionally, you can use the following options when starting an instance:
   generation.
 - `mail`: start a [smtp4dev](https://github.com/rnwood/smtp4dev) server and
   configure it the mail server.
+- `webhook` start a
+  [webhook tester](https://github.com/tarampampam/webhook-tester)
 - `redis`: start a separate container for redis.
 - `redis-tls`: connect to redis over TLS.
 - `<path to app.tar.gz>`: by specifying the path to an app package this package