diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index a327f4a..371b6db 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -1118,6 +1118,7 @@
 	 * Generates a platform-specific update string from the supplied data
 	 *
 	 * @param	string	the table name
+	 * @param	array	the update data
 	 * @return	string
 	 */
 	protected function _update($table, $values)