diff --git a/ati-ti/index.php b/ati-ti/index.php
index 36b6538..af94bf0 100644
--- a/ati-ti/index.php
+++ b/ati-ti/index.php
@@ -55,7 +55,7 @@ include "../includes/courses.php";
     <li><a href="virtualizations.pdf">Virtualizations</a></li>
     <li><a href="cloud_computing.pdf">Cloud Computing</a></li>
     <li><a href="web_architecture.pdf">Web Architecture</a></li>
-    <li>Service Oriented Architecture</li>
+    <li><a href="service_oriented_architecture.pdf">Service Oriented Architecture</a></li>
     <li>Web Services Architectures</li>
     <li>Search Engines Architectures</li>
     <li>E-Business &amp; E-Commerce System Architectures</li>