diff --git a/quick_tour/the_big_picture.rst b/quick_tour/the_big_picture.rst
index 25ea4597693..7922ffdda7e 100644
--- a/quick_tour/the_big_picture.rst
+++ b/quick_tour/the_big_picture.rst
@@ -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