diff --git a/system/libraries/Session/Session_driver.php b/system/libraries/Session/Session_driver.php
index de1908a..c4fbde4 100644
--- a/system/libraries/Session/Session_driver.php
+++ b/system/libraries/Session/Session_driver.php
@@ -89,6 +89,14 @@
 
 	// ------------------------------------------------------------------------
 
+	/**
+	 * Cookie destroy
+	 *
+	 * Internal method to force removal of a cookie by the client
+	 * when session_destroy() is called.
+	 *
+	 * @return	bool
+	 */
 	protected function _cookie_destroy()
 	{
 		return setcookie(