Removing the unnecessary constructor in the welcome controller.  Also added comments in the index method that may help users new to CodeIgniter.
diff --git a/application/controllers/welcome.php b/application/controllers/welcome.php
index 79689f0..4ed6750 100644
--- a/application/controllers/welcome.php
+++ b/application/controllers/welcome.php
@@ -2,12 +2,7 @@
 
 class Welcome extends CI_Controller {
 
-	function __construct()
-	{
-		parent::__construct();
-	}
-
-	function index()
+	public function index()
 	{
 		$this->load->view('welcome_message');
 	}