diff --git a/doc/index.html b/doc/index.html
index 30c0f28..0cf1978 100644
--- a/doc/index.html
+++ b/doc/index.html
@@ -49,6 +49,7 @@
 <li><a href="entities.html">Entities or no entities</a></li>
 <li><a href="namespaces.html">Namespaces</a></li>
 <li><a href="upgrade.html">Upgrading 1.x code</a></li>
+<li><a href="threads.html">Thread safety</a></li>
 <li><a href="DOM.html">DOM Principles</a></li>
 <li><a href="example.html">A real example</a></li>
 <li><a href="contribs.html">Contributions</a></li>