diff --git a/handbook/troggle/scriptscurrent.html b/handbook/troggle/scriptscurrent.html
index ee9401d2f..22668a930 100644
--- a/handbook/troggle/scriptscurrent.html
+++ b/handbook/troggle/scriptscurrent.html
@@ -71,7 +71,13 @@ Get this from GitHub <a href="https://github.com/mshinwell/gps2survex">https://g
 <h4 id="surface">make_svx.sh</h4>
 <p>In :loser:/gpx/
 <p>Regenerates the surface tracks as survex files from GPS .gpx files.
-<p><span style="color:red">[to be documented]</span>
+  <p>Olly says [2022]: "you shouldn't need to mess around with undocumented scripts - since 2018, you can just do: 
+    <var>survexport --entrances all.3d essentials.gpx</var>"
+    <p>But that does rather rely on <var>all.3d</var> being properly generated, which  troggle does not currently do reliably and automatically.
+      <p>Documented, by <var>man survexport, survexport --help</var>,
+        and in the Survex manual on <a href="https://survex.com/docs/manual/survexport.htm">survexport</a>.
+        
+        <p><span style="color:red">[to be documented]</span>
 
 <h4 id="ocaml">convert_shx.ml</h4>
 <p>Unusually, this is in the <var>:loser:</var> repository, in :loser:/fixedpoints/scripts/convert_shx/