diff --git a/ati-ti/index.php b/ati-ti/index.php
index 4baa9f8..851a0dd 100644
--- a/ati-ti/index.php
+++ b/ati-ti/index.php
@@ -59,7 +59,7 @@ include "../includes/courses.php";
     <li><a href="web_service.pdf">Web Services Architectures</a></li>
     <li><a href="search_engine_architecture.pdf">Search Engines Architectures</a></li>
     <li><a href="ebusiness_ecommerce_system_architecture.pdf">E-Business &amp; E-Commerce System Architectures</a></li>
-    <li>Web 2.0 &amp; Social Networks Architectures</li>
+    <li><a href="web_architecture_social_network.pdf">Web 2.0 &amp; Social Networks Architectures</a></li>
     <li>Mobile System &amp; Pervasive Computing Architectures</li>
     <li>Enterprise System Architectures</li>
   </ol>
diff --git a/ati-ti/web_architecture_social_network.pdf b/ati-ti/web_architecture_social_network.pdf
new file mode 100644
index 0000000..62de51c
Binary files /dev/null and b/ati-ti/web_architecture_social_network.pdf differ