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diff --git a/index.html b/index.html
index d516e95..fb4ec29 100644
--- a/index.html
+++ b/index.html
@@ -50,6 +50,7 @@
                 <a class="sec" href="https://grafana.arf20.com">Grafana</a><br>
                 <a class="sec" href="http://deb.arf20.com">Debian repo</a><br>
                 <a class="sec" href="http://radio.arf20.com">Radio</a><br>
+                <a class="sec" href="http://os.arf20.com">Operating System Collection</a><br>
             <a class="fst" href="/astro/">Astrophotography section</a><br>
             <a class="fst" href="/webring.html">Webring</a><br>
         </main>