symfony
diff --git a/‎components/class_loader/psr4_class_loader.rst
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diff --git a/‎components/map.rst.inc
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@@ -6,58 +6,62 @@ The PSR-4 Class Loader
 
 Libraries that follow the `PSR-4`_ standard can be loaded with the ``Psr4ClassLoader``.
 
+.. versionadded:: 2.5
+    The :class:`Symfony\\Component\\ClassLoader\\Psr4ClassLoader` was
+    introduced in Symfony 2.5.
+
 .. note::
 
     If you manage your dependencies via Composer, you get a PSR-4 compatible
     autoloader out of the box. Use this loader in environments where Composer
     is not available.
 
 .. tip::
+
     All Symfony Components follow PSR-4.
 
 Usage
 -----
 
-The following example demonstrates, how you can use the
+The following example demonstrates how you can use the
 :class:`Symfony\\Component\\ClassLoader\\Psr4ClassLoader` autoloader to use
-Symfony's Yaml component. Let's imagine, you downloaded both components –
-ClassLoader and Yaml – as ZIP packages and unpacked them to a libs directory.
-
+Symfony's Yaml component. Imagine, you downloaded both the ``ClassLoader`` and
+``Yaml`` component as ZIP packages and unpacked them to a ``libs`` directory.
 The directory structure will look like this:
 
 .. code-block:: text
 
-    /
-    +- libs
-    |  +- ClassLoader
-    |  |  +- Psr4ClassLoader.php
-    |  |  +- …
-    |  +- Yaml
-    |     +- Yaml.php
-    |     +- …
-    +- config.yml
-    +- test.php
+    libs/
+        ClassLoader/
+            Psr4ClassLoader.php
+            ...
+        Yaml/
+            Yaml.php
+            ...
+    config.yml
+    test.php
 
-In ``demo.php``, to parse the file ``config.yml``, you can use the following
-code.
+In ``demo.php`` you are going to parse the ``config.yml`` file. To do that, you
+first need to configure the ``Psr4ClassLoader``:
 
 .. code-block:: php
 
     use Symfony\Component\ClassLoader\Psr4ClassLoader;
     use Symfony\Component\Yaml\Yaml;
 
-    require __DIR__ . '/lib/ClassLoader/Psr4ClassLoader.php';
+    require __DIR__.'/lib/ClassLoader/Psr4ClassLoader.php';
 
     $loader = new Psr4ClassLoader();
-    $loader->addPrefix('Symfony\\Component\\Yaml\\', __DIR__ . '/lib/Yaml');
+    $loader->addPrefix('Symfony\\Component\\Yaml\\', __DIR__.'/lib/Yaml');
     $loader->register();
 
-    $data = Yaml::parse(__DIR__ . '/demo.yml');
+    $data = Yaml::parse(__DIR__.'/demo.yml');
 
-First of all, we've loaded our class loader manually using ``require`` since we
-don't have an autoload mechanism, yet. With the ``addPrefix()`` call, we told
-the class loader where to look for classes with the namespace prefix
-``Symfony\Component\Yaml\``. After registering the autoloader, the Yaml
-component is ready to use.
+First of all, the class loader is loaded manually using a ``require``
+statement, since there is no autoload mechanism yet. With the
+:method:`Symfony\Component\ClassLoader\Psr4ClassLoader::addPrefix` call, you
+tell the class loader where to look for classes with the
+``Symfony\Component\Yaml\`` namespace prefix. After registering the autoloader,
+the Yaml component is ready to use.
 
 .. _PSR-4: http://www.php-fig.org/psr/psr-4/
@@ -4,6 +4,7 @@
 
   * :doc:`/components/class_loader/introduction`
   * :doc:`/components/class_loader/class_loader`
+  * :doc:`/components/class_loader/psr4_class_loader`
   * :doc:`/components/class_loader/map_class_loader`
   * :doc:`/components/class_loader/cache_class_loader`
   * :doc:`/components/class_loader/debug_class_loader`