diff --git a/cave_data/1623-2023-MM-01.html b/cave_data/1623-2023-MM-01.html
index c08627f6d..0d4c06691 100644
--- a/cave_data/1623-2023-MM-01.html
+++ b/cave_data/1623-2023-MM-01.html
@@ -40,8 +40,8 @@ code used in the Austrian kataster e.g '1/S +' - https://expo/.survex.com/katast
 
 <entrance>
   <entranceslug>1623-2023-MM-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 -->
-  <!-- DEBUG  1623-2023-MM-01+1623-2023-MM-01 'Z' == -->
-  <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.  -->
+  <!-- DEBUG  1623-2023-MM-01+1623-2023-MM-01 'Z' =a= -->
+  <letter>a</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>Merryn Matthews, Joel Stobbart, Emily Mabbet, Tom Phillips, Lizzie Caisley</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. -->