diff --git a/messenger.rst b/messenger.rst
index ac07b40c624..e5a4da76cf9 100644
--- a/messenger.rst
+++ b/messenger.rst
@@ -1295,6 +1295,15 @@ during a request::
         :class:`Symfony\\Bundle\\FrameworkBundle\\Test\\KernelTestCase`
         or :class:`Symfony\\Bundle\\FrameworkBundle\\Test\\WebTestCase`.
 
+.. tip::
+
+    Using ``in-memory://?serialize=true`` as dsn will perform message serialization as real asynchronous transport will do.
+    Useful to test an additional layer, especially when you use your own message serializer.
+
+.. versionadded:: 5.3
+
+    The ``in-memory://?serialize=true`` dsn was introduced in Symfony 5.3.
+
 Amazon SQS
 ~~~~~~~~~~