upgrade change log for redis database option.

changes.md

@@ -90,3 +90,15 @@ English pluralization and singularization is now automatic. Just completely repl
 ### Add the **fetch** option to your database configuration file.
 
 A new **fetch** option allows you to specify in which format you receive your database results. Just copy and paste the option from the new **application/config/database.php** file.
+
+### Add **database** option to your Redis configuration.
+
+If you are using Redis, add the "database" option to your Redis connection configurations. The "database" value can be zero by default.
+
+	'redis' => array(
+		'default' => array(
+			'host' => '127.0.0.1',
+			'port' => 6379,
+			'database' => 0
+		),
+	),
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