Minor tweaks

Author: javiereguiluz

event_dispatcher.rst

@@ -163,8 +163,9 @@ having to add any configuration in external files::
     }
 
 You can add multiple ``#[AsEventListener]`` attributes to configure different methods.
-In the below example, for ``foo`` event, ``onFoo`` method will be called
-implicitly if method attribute is not set::
+The ``method`` property is optional, and when not defined, it defaults to
+``on`` + uppercased event name. In the example below, the ``'foo'`` event listener
+doesn't explicitly define its method, so the ``onFoo()`` method will be called::
 
     namespace App\EventListener;