diff --git a/docs/source/_templates/layout.html b/docs/source/_templates/layout.html
index d2fde98..0b831eb 100644
--- a/docs/source/_templates/layout.html
+++ b/docs/source/_templates/layout.html
@@ -12,6 +12,8 @@
         <a href="https://www.youtube.com/channel/UCYu8B1eFb-gRemamXod-exQ">HED YouTube channel</a></li>
       <li class="toctree-li">
         <a href="https://hed-specification.readthedocs.io/en/latest/index.html">HED specification</a></li>
+      <li class="toctree-li">
+        <a href="https://hed-specification.readthedocs.io/en/latest/08_HED_ontology.html">HED ontology</a></li>
       <li class="toctree-li"><a href="https://hedtools.org/hed">Online tools</a></li>
       <li class="toctree-li"><a href="https://hed-python.readthedocs.io/en/latest/">HEDTools API</a></li>
       <li class="toctree-li"><a href="https://hed-web.readthedocs.io/en/latest/">Web deployment</a></li>