diff --git a/cave_data/2012-OW-01.html b/cave_data/2012-OW-01.html
index e1c90a159..4d9cb9543 100644
--- a/cave_data/2012-OW-01.html
+++ b/cave_data/2012-OW-01.html
@@ -36,7 +36,12 @@ code used in the Austrian kataster e.g '1/S +' - https://expo/.survex.com/katast
   <letter></letter><!--Leave blank for single-entrance cave. If there is more than one entrace then the letter needs to be given. Generally matches the entranceslug ID.  -->
 </entrance>
 
-<explorers></explorers><!-- 'CUCC Expo' and year(s) of exploration. To distinguish from caves explored by foreign groups. Individual names can be given too if it was a small cave. -->
+<entrance>
+  <entranceslug>2012-OW-01</entranceslug><!-- Internal ID to refer to each entrance instance in the entrance files (typically the same as that filename (e.g. 1623-161c). Matches the 'slug' field in the entrance file -->
+  <letter></letter><!--Leave blank for single-entrance cave. If there is more than one entrace then the letter needs to be given. Generally matches the entranceslug ID.  -->
+</entrance>
+
+<explorers>CUCC, Ollie, Frank</explorers><!-- 'CUCC Expo' and year(s) of exploration. To distinguish from caves explored by foreign groups. Individual names can be given too if it was a small cave. -->
 <underground_description></underground_description><!-- Underground description. (description of approach and entrance goes in entrance file). For a small cave this will be the entire description. For larger caves it will be the front page of the description, or a short intro, containing links to other pages with the cave description in, or even nothing but a link. -->
 <equipment></equipment><!-- For a small cave, summary of gear needed to descend. For longer caves it could be blank, a table, or just refer to the description/topos. Leave blank if this info is in the description. -->
 <references>2012#18</references><!-- References to documentation. Could be Journal articles or Logbook entries. Can be links if the docs are online. -->