diff --git a/admin_manual/configuration_server/performance_tuning.rst b/admin_manual/configuration_server/performance_tuning.rst
index ae30d288c..1d51a9d28 100644
--- a/admin_manual/configuration_server/performance_tuning.rst
+++ b/admin_manual/configuration_server/performance_tuning.rst
@@ -61,8 +61,11 @@ performance. To do so, add the following to ``/etc/fstab``::
 Caching
 =======	
 
-Install the APC or Opcache bytecode cache. This example is for 
-CentOS/Red Hat/Fedora running PHP 5.4:
+Caching improves performance by storing data, code, and other objects in 
+memory. 
+
+The APC or OPCache bytecode cache are commonly used in PHP environments. This 
+example installs APC on CentOS/Red Hat/Fedora systems running PHP 5.4:
 
 .. code-block:: console
 
@@ -74,24 +77,22 @@ On Ubuntu systems running PHP 5.4 this command installs APC:
 
         $ 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.
+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 install APCu.
+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.
+
+The Redis key-value cache and store is an excellent fast and robust cache. For 
+configuration examples see :doc:`config_sample_php_parameters`. 
 
 Distributed PHP environments should use Memcached. Memcached servers must be 
 specified in the ``memcached_servers`` array in ownCloud's config file 
-``config.php``. For examples see :doc:`config_sample_php_parameters`
-
-OPcache Extension
------------------
-
-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.
-
+``config.php``. For examples see :doc:`config_sample_php_parameters`.
 
 Tuning System Parameters
 ========================