diff --git a/handbook/computing/newkataster.html b/handbook/computing/newkataster.html
index 415a73495..d3a65c4f4 100644
--- a/handbook/computing/newkataster.html
+++ b/handbook/computing/newkataster.html
@@ -1,4 +1,4 @@
-<html><head><title>New Katasetr Number Procedure</title></head><body>
+<html><head><title>New Kataster Number Procedure</title></head><body>
 <h2 id="tophead">Data Maintenance - new cave id</h2>
 <h1>Expo Data Maintenance</h1>
 
@@ -35,13 +35,82 @@ Troggle:  in the :expoweb: repo
 <p> more here..
   
 <h2>Edit the survex files</h2>
-<p> more here..
+<p> more here.. Need to edit this neatly.. taken from<var>:loser:/kataster-renumbering-README.txt</var>
+<pre>
+README for renumbering caves using new kataster numbers
+
+e.g. 2023-ASH-15 => 1623-303
+
+
+NB We are moving the survex files to new directories, but (not yet) moving the cave description and entrance description files.
+
+expoweb/cave_data/1623-2023-ASH-15.html 
+1. Edit the cave file expoweb/cave_data/1623-2023-ASH-15.html and change to <caveslug>1623-303</caveslug>
+2. Add the new kataster number: <kataster_number>303</kataster_number>
+3. Leave this untouched: <unofficial_number>2023-ASH-15</unofficial_number>
+4. Don't touch the <entranceslug>1623-2023-ASH-15</entranceslug> field for all the entrances
+
+In the loser repo, rename the folder
+loser/2023-ASH-15/
+to
+loser/303/
+
+and then inside that folder rename the file
+2023-ASH-15.svx
+to
+303.svx
+
+And then edit any survex files which refer to that survex data ! (more explanation needed)
+
+Change *fix points in loser/fixedpts/gps/gps23.svx from
+*fix 1623.p2023-ASH-15 ...
+to
+*fix 1623.p303...
+
+This may well not work due to the crapness of the "system" of recording fixed points. Much 
+time can now be wasted tracking down how the cave is located, furtling around in the innards
+of files sprinkled all over the database. Remember that 1626 caves are stored in a completely
+different way to 1623 caves.
+
+Now go back and edit all the entrances of the cave to refer to this new *fix point 
+in the entrance editing page on
+/1623/303/303.html
+Select each entrance and look at the field
+"Tag station: Survex station id, e.g. 1623.p2023-aa-01: " 
+and change
+1623.p2023-ASH-15
+to
+1623.p303
+
+If there is more than one entrance, this would be
+1623.p2023-ASH-15a
+to
+1623.p303a
+
+for a, b. c etc.
+
+Find all the wallets for this cave
+/cave/scans/1623-2023-ASH-15
+and in each of them use the wallet edit page to correct the svx file link from
+['caves-1623/2023-ASH-15/2023-ASH-15.svx']
+to
+['caves-1623/303/303.svx']
+</pre>
 
   
 <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>.
+  <br /><em>However</em>, if you make a formatting mistake, all of troggle will <em>break instantly</em>.
+    
+<ul>
+  <li>go to the webpage
+https://expo.survex.com/cave_data/cavealiases.txt_edit
+    <li>Add the alias to some sensible place in this file, e.g. (using the example above)<br />
+        ("2023-ASH-15", "1623-303"),
+    <li>Save and exit.
+</ul>
+adding this alias means that old logbook entries and wallets that refer to '2023-ASH-15' will be redirected to 1623-303 properly.
 
 <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%)
