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--- a/years/2011/index.html
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@@ -1,14 +1,17 @@
 
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
 <html>
 <head>
 <title>Expo 2011: documentation index</title>
+<link rel="stylesheet" type="text/css" href="../../css/main2.css" />
 </head>
 <body>
 <h1>Expo 2011: documentation index</h1>
 
 <h2><span style="font-weight: bold;">Pre-Expo Documentation</span></h2>
 <ul>
-<li><a href="http://www.srcf.ucam.org/caving/wiki/Expo_2011/">Expo 	planning wiki</a></li>
+<li><a href="http://www.srcf.ucam.org/caving/wiki/Expo_2011/">Expo planning wiki</a></li>
 <li><a href="expo-accounting.odt">Accounting Policy</a></li>
 </ul>
 <h2><span style="font-weight: bold;">Post-Expo Documentation</span></h2>
