diff --git a/messenger.rst b/messenger.rst
index d2d8a4b8b0c..3f8d84473ee 100644
--- a/messenger.rst
+++ b/messenger.rst
@@ -100,9 +100,11 @@ Once you've created your handler, you need to register it:
 Transports
 ----------
 
-The communication with queuing systems or third parties is delegated to
-libraries for now. The built-in AMQP transport allows you to communicate with
-most of the AMQP brokers such as RabbitMQ.
+By default, messages are processed as soon as they are dispatched. If you prefer
+to process messages asynchronously, you must configure a transport. These
+transports communicate with your application via queuing systems or third parties.
+The built-in AMQP transport allows you to communicate with most of the AMQP
+brokers such as RabbitMQ.
 
 .. note::