diff --git a/app/templates/post/post.html b/app/templates/post/post.html
index 561ea229..92573545 100644
--- a/app/templates/post/post.html
+++ b/app/templates/post/post.html
@@ -149,7 +149,7 @@
                     {% endif %}
                 {% endmacro %}
 
-                <div id="replies" class="comments" role="tree" aria-label="{{ _('Comments') }}">
+                <div id="replies" class="comments" role="tree" aria-label="{{ _('Comments') }}" aria-expanded="true">
                     {% for reply in replies %}
                       {{ render_comment(reply) | safe }}
                     {% endfor %}