diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index a3bf569..d90f79a 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -65,6 +65,11 @@
     		<li>Added 'application/vnd.ms-powerpoint' to list of mime types.</li>
     	</ul>
     </li>
+	<li>Libraries
+		<ul>
+			<li>Added increased security for filename handling in the Upload library.</li>
+		</ul>
+	</li>
     <li>Helpers
     	<ul>
     		<li>Modified <kbd>img()</kbd> in the <a href="helpers/html_helper.html">HTML Helper</a> to remove an unneeded space (#4208).</li>