diff --git a/user_guide_src/source/extending/core_classes.rst b/user_guide_src/source/extending/core_classes.rst
index efb42c53034e..a1731e7e460a 100644
--- a/user_guide_src/source/extending/core_classes.rst
+++ b/user_guide_src/source/extending/core_classes.rst
@@ -22,26 +22,41 @@ System Class List
 The following is a list of the core system classes that are invoked every time CodeIgniter runs:
 
 *  ``CodeIgniter\Autoloader\Autoloader``
+*  ``CodeIgniter\Autoloader\FileLocator``
+*  ``CodeIgniter\Cache\CacheFactory``
+*  ``CodeIgniter\Cache\Handlers\BaseHandler``
+*  ``CodeIgniter\Cache\Handlers\FileHandler``
+*  ``CodeIgniter\Cache\ResponseCache``
 *  ``CodeIgniter\CodeIgniter``
+*  ``CodeIgniter\Config\BaseService``
 *  ``CodeIgniter\Config\DotEnv``
+*  ``CodeIgniter\Config\Factories``
 *  ``CodeIgniter\Config\Services``
 *  ``CodeIgniter\Controller``
+*  ``CodeIgniter\Cookie\Cookie``
+*  ``CodeIgniter\Cookie\CookieStore``
 *  ``CodeIgniter\Debug\Exceptions``
 *  ``CodeIgniter\Debug\Timer``
 *  ``CodeIgniter\Events\Events``
 *  ``CodeIgniter\Filters\Filters``
-*  ``CodeIgniter\HTTP\ContentSecurityPolicy``
 *  ``CodeIgniter\HTTP\CLIRequest`` (if launched from command line only)
+*  ``CodeIgniter\HTTP\ContentSecurityPolicy``
+*  ``CodeIgniter\HTTP\Header``
 *  ``CodeIgniter\HTTP\IncomingRequest`` (if launched over HTTP)
+*  ``CodeIgniter\HTTP\Message``
+*  ``CodeIgniter\HTTP\OutgoingRequest``
 *  ``CodeIgniter\HTTP\Request``
 *  ``CodeIgniter\HTTP\Response``
-*  ``CodeIgniter\HTTP\Message``
+*  ``CodeIgniter\HTTP\SiteURI``
+*  ``CodeIgniter\HTTP\SiteURIFactory``
 *  ``CodeIgniter\HTTP\URI``
+*  ``CodeIgniter\HTTP\UserAgent`` (if launched over HTTP)
 *  ``CodeIgniter\Log\Logger``
 *  ``CodeIgniter\Log\Handlers\BaseHandler``
 *  ``CodeIgniter\Log\Handlers\FileHandler``
 *  ``CodeIgniter\Router\RouteCollection``
 *  ``CodeIgniter\Router\Router``
+*  ``CodeIgniter\Superglobals``
 *  ``CodeIgniter\View\View``
 
 Replacing Core Classes