--- a/web/topics.shtml
+++ b/web/topics.shtml
@@ -239,6 +239,12 @@
 <a href="entries/FunWithTilings.shtml">FunWithTilings</a> &nbsp;
 </div>
 
+<h3>Probability Theory</h3>
+
+<div class="list">
+<a href="entries/Markov_Models.shtml">Markov_Models</a> &nbsp;
+</div>
+
 
 </td></tr>    
 </tbody>