diff --git a/mailer.rst b/mailer.rst
index 9c9c1451add..39f2cb42081 100644
--- a/mailer.rst
+++ b/mailer.rst
@@ -1094,6 +1094,52 @@ you have a transport called ``async``, you can route the message there:
Thanks to this, instead of being delivered immediately, messages will be sent to
the transport to be handled later (see :ref:`messenger-worker`).
+You can configure which bus is used to dispatch the message using the ``message_bus`` option.
+You can also set this to ``false`` to call the Mailer transport directly and
+disable asynchronous delivery.
+
+.. configuration-block::
+
+ .. code-block:: yaml
+
+ # config/packages/mailer.yaml
+ framework:
+ mailer:
+ message_bus: app.another_bus
+
+ .. code-block:: xml
+
+
+
+
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