Describe things more precisely

greg0ire · greg0ire · commit 6f6422c9a00a · 2019-01-05T22:10:14.000+01:00
Here, namespace is referring to that kind of thing:

    App\Namespace\:
        resource: '../../src/App/Namespace/*'

And it looks as if there is no word yet to name that kind of
configuration block. Let us go with service definition prototype.
diff --git a/service_container/autowiring.rst b/service_container/autowiring.rst
@@ -338,9 +338,12 @@ dealing with the ``TransformerInterface``.
 
 .. tip::
 
-    As long as there is only one class implementing the interface and that class
-    is part of the same namespace configuring the alias is not mandatory and Symfony
-    will automatically create one.
+    When using a `service definition prototype`_, if only one service is
+    discovered that implements an interface, and that interface is also
+    discovered at the same time, configuring the alias is not mandatory
+    and Symfony will automatically create one.
+
+.. _service definition prototype: https://symfony.com/blog/new-in-symfony-3-3-psr-4-based-service-discovery
 
 Dealing with Multiple Implementations of the Same Type
 ------------------------------------------------------
