diff --git a/book/installation.rst b/book/installation.rst
index e01c0d942b8..a462d6141b1 100644
--- a/book/installation.rst
+++ b/book/installation.rst
@@ -20,8 +20,8 @@ Installing a Symfony2 Distribution
 .. tip::
 
     First, check that you have installed and configured a Web server (such
-    as Apache) with PHP 5.3.8 or higher. For more information on Symfony2
-    requirements, see the :doc:`requirements reference </reference/requirements>`.
+    as Apache) with PHP. For more information on Symfony2 requirements, see the
+    :doc:`requirements reference </reference/requirements>`.
 
 Symfony2 packages "distributions", which are fully-functional applications
 that include the Symfony2 core libraries, a selection of useful bundles, a
diff --git a/reference/requirements.rst b/reference/requirements.rst
index 39ddfa25a65..46568005ea1 100644
--- a/reference/requirements.rst
+++ b/reference/requirements.rst
@@ -24,6 +24,11 @@ Required
 * ctype needs to be enabled
 * Your ``php.ini`` needs to have the ``date.timezone`` setting
 
+.. caution::
+
+    Be aware that Symfony2 has some known limitations when using PHP 5.3.8
+    or below. For more information see the `Requirements section of the readme`_
+
 Optional
 --------
 
@@ -48,3 +53,5 @@ Doctrine
 If you want to use Doctrine, you will need to have PDO installed. Additionally,
 you need to have the PDO driver installed for the database server you want
 to use.
+
+.. _`Requirements section of the readme`: https://github.com/symfony/symfony#requirements