symfony
diff --git a/‎quick_tour/the_big_picture.rst
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+8Lines changed: 8 additions & 0 deletions
@@ -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