+{% comment %}
+The div with id "old-version-warning" is automatically enabled by the Apache
+config under certain conditions, as described at
+https://dev.arvados.org/projects/ops/wiki/Docarvadosorg. Changing the class
+should be safe, but please double check the matching and substitution that is
+done in the Apache config to be sure before you modify this div.
+{% endcomment %}
+ <div class="alert alert-block alert-info" style="display: none;" id="old-version-warning">
+ WARNING - you are viewing the documentation for an old version of Arvados. For the latest version, click <a href="/">here</a>.
+ </div>