diff --git a/content/about.html b/content/about.html
index 7922ab9c9f94eeb58e62fce20c62ca9cb174998a..36e5df281fab1c9d00b4ae91aa9cf5ab50b2d534 100644
--- a/content/about.html
+++ b/content/about.html
@@ -60,11 +60,15 @@ written by Peter Winichenko.</p>
 
 <h2>Web server</h2>
 
-<p>
-PET analysis page 
+<p>PET analysis page 
 hosted by: <a href="http://www.webhotelli.fi/">webhotelli.fi</a>
 </p>
 
+<p>If the main site is down, you can use backup site at
+<a href="http://users.utu.fi/vesoik/petanalysis/">http://users.utu.fi/vesoik/petanalysis/</a>,
+but note that it is updated infrequently.
+</p>
+
 <br>
 
 <div class="images">