diff --git a/system/libraries/Cache/drivers/Cache_redis.php b/system/libraries/Cache/drivers/Cache_redis.php
index e9194a4..a58aaef 100644
--- a/system/libraries/Cache/drivers/Cache_redis.php
+++ b/system/libraries/Cache/drivers/Cache_redis.php
@@ -144,7 +144,7 @@
 	/**
 	 * Get cache
 	 *
-	 * @param	string	Cache ID
+	 * @param	string	$key	Cache ID
 	 * @return	mixed
 	 */
 	public function get($key)
@@ -196,7 +196,7 @@
 	/**
 	 * Delete from cache
 	 *
-	 * @param	string	Cache key
+	 * @param	string	$key	Cache key
 	 * @return	bool
 	 */
 	public function delete($key)
@@ -261,9 +261,9 @@
 	/**
 	 * Get cache driver info
 	 *
-	 * @param	string	Not supported in Redis.
-	 *			Only included in order to offer a
-	 *			consistent cache API.
+	 * @param	string	$type	Not supported in Redis.
+	 *				Only included in order to offer a
+	 *				consistent cache API.
 	 * @return	array
 	 * @see		Redis::info()
 	 */
@@ -277,7 +277,7 @@
 	/**
 	 * Get cache metadata
 	 *
-	 * @param	string	Cache key
+	 * @param	string	$key	Cache key
 	 * @return	array
 	 */
 	public function get_metadata($key)