diff --git a/index.html b/index.html
index dfa77fa..547705b 100644
--- a/index.html
+++ b/index.html
@@ -124,6 +124,9 @@
 		</section>
 		<section id="O">
 			<h2>O</h2>
+			<ul>
+				<li><ziba-link>online advertising</ziba-link></li>
+			</ul>
 		</section>
 		<section id="P">
 			<h2>P</h2>