diff --git a/handbook/computing/newkataster.html b/handbook/computing/newkataster.html
index 987842ec8..511d06acf 100644
--- a/handbook/computing/newkataster.html
+++ b/handbook/computing/newkataster.html
@@ -1,9 +1,88 @@
 <html><head><title>New Katasetr Number Procedure</title></head><body>
-<h2>Experts only</h2>
+<h2 id="tophead">Data Maintenance - new cave id</h2>
+<h1>Expo Data Maintenance</h1>
 
-<p>The cave id on discovery, e.g.  and on its very first mention in the system, which would be in one or more of:
+
+
+<h2 id="intro">Experts only</h2>
+
+<p>The cave id on discovery, e.g. <b>2018-dm-07</b> and on its very first mention in the system, which would be in one or more of:
   <ul>
     <li>a logbook entry
     <li>a survex file
     <li>a wallet entry with scan of in-field handwritten notes
-    </ul></body></html>
+    </ul>
+e.g. Homecoming had to be renamed from <b>2018-dm-07</b> to <b>1626-356</b>.
+
+<h3>We do <em>not</em> need to go back and edit old logbooks and wallets</h3>
+<p>Logbooks and wallets are entirely managed by troggle, so a single edit to the troggle 'cave name alias list' 
+  at <a href="/cave_data/cavealiases.txt">/cave_data/cavealiases.txt</a> is enough.
+  <br />e.g. <var>("1626-2018-dm-07", "1623-356"),</var><br />See <a href="#cavealiases">Cave Aliases</a> below for full examples.
+
+<h3>We <em>do</em> need to edit the survex files and cave_data filenames</h3>
+Survex:  in the :loser: repo
+<ul>
+  <li>the survex files must be renamed
+<li> many survex files must be edited to match the new names
+</ul>
+Troggle:  in the :expoweb: repo
+<ul>
+<li>The files in :expoweb:/cave_data/ and :expoweb:/entrance_data must be renamed
+<li> the folder names in,  :expoweb:/1623/, :expoweb:/1626/ etc. must be renamed
+</ul>
+  
+
+<h2>Edit the survex files</h2>
+<p> more here..
+
+<h2>Edit the cave_data filenames</h2>
+<p> more here..
+
+  
+<h2 id=cavealiases>Cave Aliases</h2>
+<p> Cave alias names can be edited by any logged-in user using an online form:
+<a href="/cave_data/cavealiases.txt_edit">/cave_data/cavealiases.txt</a>
+  <p><em>However</em>, if you make a formatting mistake, all of troggle will <em>break instantly</em>.
+
+<p>When a lot are being done, as Becka did in 2024 when she got the new kataster numbers 1623-303 to 1623-316, it is a good idea to cross check (or to edit with a macro) the output from git, e.g.
+<pre><code> # rename caves-1623/{2023-ASH-15/2023-ASH-15.svx => 303/303.svx} (94%)
+ # rename caves-1623/{2023-mg-02/2023-mg-02.svx => 304/304.svx} (90%)
+ # rename caves-1623/{2023-mg-01/2023-mg-01.svx => 305/305.svx} (94%)
+ # rename caves-1623/{2023-ASH-17/2023-ASH-17.svx => 306/306.svx} (94%)
+ # rename caves-1623/{2023-ASH-05/2023-ASH-05.svx => 307/307.svx} (89%)
+ # rename caves-1623/{2023-ASH-08/2023-ASH-08.svx => 308/308.svx} (93%)
+ # rename caves-1623/{2023-ASH-09/2023-ASH-09.svx => 309/309.svx} (94%)
+ # rename caves-1623/{2023-mg-04/2023-mg-04.svx => 310/310.svx} (91%)
+ # rename caves-1623/{2023-ASH-16/2023-ASH-16.svx => 311/311.svx} (93%)
+ # rename caves-1623/{2023-RAWDB-02/2023-RAWDB-02.svx => 312/312.svx} (92%)
+ # rename caves-1623/{2023-RAWDB-01/2023-RAWDB-01.svx => 313/313.svx} (92%)</code></pre>
+
+  to <pre><code>        ("2023-ASH-15",   "1623-303"),
+        ("2023-mg-02",    "1623-304"),
+        ("2023-mg-01",    "1623-305"),
+        ("2023-ASH-17",   "1623-306"),
+        ("2023-ASH-05",   "1623-307"),
+        ("2023-ASH-08",   "1623-308"),
+        ("2023-ASH-09",   "1623-309"),
+        ("2023-mg-04",    "1623-310"),
+        ("2023-ASH-16",   "1623-311"),
+        ("2023-RAWDB-02", "1623-312"),
+        ("2023-RAWDB-01", "1623-313"),</code></pre>
+
+We also use this alias file to cope with cavers using variant spellings for cave names in wallets and logbooks, e.g.<pre><code>        ("balcony", "1623-264"),
+        ("balkon", "1623-264"),
+        ("balconhoehle", "1623-264"),
+        ("balkonhoehle", "1623-264"),
+        ("balkonhohle", "1623-264"),
+        ("balconhohle", "1623-264"),
+        ("Balkon Hoehle", "1623-264"),</code></pre>
+
+<p>Some troggle pages will use a new alias immediately, others (most, in fact) will not take any notice until after a DatabaseReset is done.
+  
+<hr />
+Return to: 
+<a href="/handbook/computing/manual.html">data maintenance</a><br />
+Return to: 
+<a href="/handbook/computing/onlinesystems.html">expo online systems overview</a><br />
+Troggle index: 
+<a href="/handbook/troggle/trogindex.html">Index of all troggle documents</a><br /><hr /></body></html>
