diff --git a/CHANGES.html b/CHANGES.html
index b3cdfb6f2..37afa13cb 100644
--- a/CHANGES.html
+++ b/CHANGES.html
@@ -170,7 +170,9 @@ us a note on ns-developers mailing list.</p>
 </ul>
 <h2>Changes to build system:</h2>
 <ul>
-<li></li>
+<li>Waf shipped with ns-3 has been upgraded to version 1.7.10 and custom
+  pkg-config generator has been replaced by Waf's builtin tool.
+</li>
 </ul>
 
 <h2>Changed behavior:</h2>