added form_button to form helper
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index b8bbb33..7ba6c3e 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -69,6 +69,7 @@
 		<ul>

 			<li>Added increased security for filename handling in the Upload library.</li>

 			<li>Added increased security for sessions for client-side data tampering.</li>

+    		<li>Added <kbd>form_button()</kbd> in the <a href="helpers/form_helper.html">Form helper</a>.</li>

 		</ul>

 	</li>

     <li>Helpers