diff --git a/handbook/computing/surveylaptop.html b/handbook/computing/surveylaptop.html
index e616911e6..b69dc73d2 100644
--- a/handbook/computing/surveylaptop.html
+++ b/handbook/computing/surveylaptop.html
@@ -72,7 +72,7 @@ but all the recommended software here is open source (and please don't install p
 <li><p><a href="https://www.youtube.com/watch?v=nBhx0gRTJb0">
   Intro to Therion: Drawing and Compiling Your First Scrap</a> - YouTube. Which uses this <a href="https://github.com/Greenman126/Christians-Therion-Template">Therion template stuff</a>. By Christian DeCelle (18 Sept.2023).
 
-<li><a href="../../documents/tunnel-loefflerCP35-only.pdf">Introduction to using Tunnel</a> - article by Dave Loeffler. This is really good and should be read first.
+  <li><a href="/expofiles/documents/surveying/documents/tunnel-loefflerCP35-only.pdf">Introduction to using Tunnel</a> - article by Dave Loeffler. This is really good and should be read first.
 
 <li><a href="http://expo.survex.com/expofiles/tunnelwiki/wiki/pages/Tunnel.html">The Tunnel tutorial</a> - installation notes and a wiki of examples and tutorials
 <li><a href="https://github.com/CaveSurveying/tunnelx">Tunnel - master copy since August 2019</a>. This is where the software is actively developed and is the most up to date copy, but the documentation is not as complete as in the other locations.