diff --git a/nsupdate/nsupdate/templates/base.html b/nsupdate/nsupdate/templates/base.html
index f474333..1d8cf04 100644
--- a/nsupdate/nsupdate/templates/base.html
+++ b/nsupdate/nsupdate/templates/base.html
@@ -94,6 +94,10 @@
                 <a href="https://github.com/ThomasWaldmann/">Thomas Waldmann</a>.
                 &nbsp;|&nbsp;
                 <a href="{% url 'legal' %}">Legal notice</a>
+                &nbsp;|&nbsp;
+                <a href="http://validator.w3.org/check/referrer">Valid HTML</a>
+                &nbsp;|&nbsp;
+                <a href="http://jigsaw.w3.org/css-validator/check/referer">Valid CSS</a>
             </p>
             </div>
         </div>