diff --git a/_includes/navbar.html b/_includes/navbar.html
index 9db636a2..5e7d20eb 100644
--- a/_includes/navbar.html
+++ b/_includes/navbar.html
@@ -80,7 +80,9 @@
             {% else %}
               {% assign extra = lesson_extra %}
             {% endif %}
-            <li><a href="{{ relative_root_path }}{{ extra.url }}">{{ extra.title }}</a></li>
+            {% unless extra.exclude %}
+              <li><a href="{{ relative_root_path }}{{ extra.url }}">{{ extra.title }}</a></li>
+            {% endunless %}
             {% endfor %}
           </ul>
         </li>