diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index e08b715..35f67fd 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -143,6 +143,7 @@
 	<li>Fixed a bug in display_error() in the DB driver that was instantiating new Language and Exception objects, and not using the error heading.</li>
 	<li>Fixed an array to string conversion error in the Validation library (#4425)</li>
 	<li>Fixed a bug (#4506) with overlay_watermark() in the Image library preventing support for PNG-24s with alpha transparency</li>
+	<li>Fixed a bug (#4153) in the XML-RPC class preventing dateTime.iso8601 from being used.</li>
 </ul>
 
 <h2>Version 1.6.1</h2>