diff --git a/system/src/Grav/Common/Cache.php b/system/src/Grav/Common/Cache.php
index e8967f1f7..9baf42995 100644
--- a/system/src/Grav/Common/Cache.php
+++ b/system/src/Grav/Common/Cache.php
@@ -17,6 +17,7 @@ use RocketTheme\Toolbox\Event\Event;
  * The GravCache object is used throughout Grav to store and retrieve cached data.
  * It uses DoctrineCache library and supports a variety of caching mechanisms. Those include:
  *
+ * APCu
  * APC
  * XCache
  * RedisCache