CodeIgniter Memcached Caching

[eluser]sweetD[/eluser]
So I read the below in the user guide but there is no memcached.php in the applicaiton/config/ directory. A bit confused as how to go about and use this feature.

Memcached Caching

Multiple Memcached servers can be specified in the memcached.php configuration file, located in the application/config/ directory.

All of the functions listed above can be accessed without passing a specific adapter to the driver loader as follows:

$this->load->driver('cache');
$this->cache->memcached->save('foo', 'bar', 10);
For more information on Memcached, please see http://php.net/memcached

http://ellislab.com/codeigniter/user-gui...#memcached