diff --git a/admin_manual/configuration_server/performance_tuning.rst b/admin_manual/configuration_server/performance_tuning.rst
index 48666ef53..ebc2ce3d4 100644
--- a/admin_manual/configuration_server/performance_tuning.rst
+++ b/admin_manual/configuration_server/performance_tuning.rst
@@ -57,6 +57,40 @@ Enable JavaScript and CSS Asset Management
 
 See :doc:`js_css_asset_management_configuration` for a description and the 
 benefits.
+
+.. _caching:
+
+*******
+Caching
+*******
+
+Make sure the APC or Opcache bytecode cache is installed. This example is for 
+CentOS/Red Hat/Fedora running PHP 5.4:
+
+.. code-block:: console
+
+	$ sudo yum install php-pecl-apc
+	
+On Ubuntu systems running PHP 5.4 this command installs APC:
+
+.. code-block:: console
+
+        $ sudo apt-get install php-apc
+             
+PHP 5.5 replaces APC with OPCache. OPCache is bundled with PHP 5.5 so it should 
+not be necessary to install it separately. OPCache improves PHP performance by 
+storing precompiled script bytecode in shared memory, thereby removing the need 
+for PHP to load and parse scripts on each request. This extension is bundled 
+with PHP 5.5.0 and later, and is available in PECL for PHP versions 5.2, 5.3, 
+and 5.4.
+
+APC is both an opcode cache and data store. OPCache is only an opcode cache, so 
+for caching user data you should also install APCu.
+
+You can test the state of APC(u) by putting the testing file from the documentation
+in your server root. It is usually called 'apc.php' and can be found in
+/usr/share/doc/php5-apcu/apc.php or /usr/share/doc/packages/php5-apcu/apc.php or
+a similar location, depending on your distribution.
           
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