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8 changes: 8 additions & 0 deletions quick_tour/the_big_picture.rst
Original file line number Diff line number Diff line change
Expand Up @@ -89,6 +89,14 @@ main concepts. Go to the following URL to be greeted by Symfony2 (replace
.. image:: /images/quick_tour/hello_fabien.png
:align: center

.. note::

Instead of the greeting page, you may see a blank page or an error page.
This is caused by a directory permission misconfiguration. There are several
possible solutions depending on your operating system. All of them are
explained in the :ref:`Setting up Permissions <book-installation-permissions>`
section of the official book.

What's going on here? Have a look at each part of the URL:

* ``app_dev.php``: This is a :term:`front controller`. It is the unique entry
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