Finished the rewording of the "profiler storage" article

Author: javiereguiluz

Diff for: cookbook/profiler/storage.rst

@@ -4,6 +4,21 @@
 Switching the Profiler Storage
 ==============================
 
-By default the profile stores the collected data in files in the ``%kernel.cache_dir%/profiler/`` directory.
-You can control the storage by implementing the ``Symfony\Component\HttpKernel\Profiler\ProfilerStorageInterface`` in 
-your own service and override the ``profiler.storage`` service.
+In Symfony versions previous to 2.8, profiles could be stored in files, databases,
+services like Redis and Memcache, etc. Starting from Symfony 2.8, the only storage
+mechanism with built-in support is the filesystem.
+
+By default the profile stores the collected data in the ``%kernel.cache_dir%/profiler/``
+directory. If you want to use another location to store the profiles, define the
+``dsn`` option of the ``framework.profiler``:
+
+.. code-block:: yaml
+
+    # app/config/config.yml
+    framework:
+        profiler:
+            dsn: 'file:/tmp/symfony/profiler'
+
+You can also create your own profile storage service implementing the
+:class:``Symfony\Component\HttpKernel\Profiler\ProfilerStorageInterface`` and
+overriding the ``profiler.storage`` service.