diff --git a/cave_data/1623-2023-hbrw-03.html b/cave_data/1623-2023-hbrw-03.html
index 87311b4a1..484657029 100644
--- a/cave_data/1623-2023-hbrw-03.html
+++ b/cave_data/1623-2023-hbrw-03.html
@@ -38,6 +38,12 @@ code used in the Austrian kataster e.g '1/S +' - https://expo/.survex.com/katast
 <kataster_number></kataster_number> <!-- (Either this or unofficial_number is required). Official number in Austrian kataster if one has been allocated  -->
 <unofficial_number>2023-hbrw-03</unofficial_number><!-- (Either this or kataster_number is required). Initial temporary cave ID used until kataster number is allocated e.g. '2012-DD-01'-->
 
+<entrance>
+  <entranceslug>1623-2023-hbrw-03</entranceslug>
+  <letter></letter>
+</entrance>
+
+
 <explorers>Radost Waszkiewicz, Honorata Bogusz</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. -->
 <survex_file></survex_file><!-- Name of top-level survey file for this cave. Relative to the 'loser' survex repository. So for most caves that's "caves/cavenum/cavnum.svx". (e.g. caves/204/204.svx -->
 <underground_description>Big open pitch -- at least 40 meters.</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. -->
diff --git a/cave_data/1623-2023-mg-02.html b/cave_data/1623-2023-mg-02.html
index 706019609..fc648b32f 100644
--- a/cave_data/1623-2023-mg-02.html
+++ b/cave_data/1623-2023-mg-02.html
@@ -38,6 +38,12 @@ code used in the Austrian kataster e.g '1/S +' - https://expo/.survex.com/katast
 <kataster_number></kataster_number> <!-- (Either this or unofficial_number is required). Official number in Austrian kataster if one has been allocated  -->
 <unofficial_number>2023-mg-02</unofficial_number><!-- (Either this or kataster_number is required). Initial temporary cave ID used until kataster number is allocated e.g. '2012-DD-01'-->
 
+<entrance>
+  <entranceslug>1623-2023-mg-02</entranceslug>
+  <letter></letter>
+</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. -->
 <survex_file>caves-1623/2023-mg-02/2023-mg-02.svx</survex_file><!-- Name of top-level survey file for this cave. Relative to the 'loser' survex repository. So for most caves that's "caves/cavenum/cavnum.svx". (e.g. caves/204/204.svx -->
 <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. -->
diff --git a/cave_data/1623-2023-mg-03.html b/cave_data/1623-2023-mg-03.html
index d22fa179f..777f1a34d 100644
--- a/cave_data/1623-2023-mg-03.html
+++ b/cave_data/1623-2023-mg-03.html
@@ -38,6 +38,11 @@ code used in the Austrian kataster e.g '1/S +' - https://expo/.survex.com/katast
 <kataster_number></kataster_number> <!-- (Either this or unofficial_number is required). Official number in Austrian kataster if one has been allocated  -->
 <unofficial_number>2023-mg-03</unofficial_number><!-- (Either this or kataster_number is required). Initial temporary cave ID used until kataster number is allocated e.g. '2012-DD-01'-->
 
+<entrance>
+  <entranceslug>1623-2023-mg-03</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></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. -->
 <survex_file></survex_file><!-- Name of top-level survey file for this cave. Relative to the 'loser' survex repository. So for most caves that's "caves/cavenum/cavnum.svx". (e.g. caves/204/204.svx -->
 <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. -->
diff --git a/cave_data/1623-2023-mg-04.html b/cave_data/1623-2023-mg-04.html
index 01fda8394..f044a9ae1 100644
--- a/cave_data/1623-2023-mg-04.html
+++ b/cave_data/1623-2023-mg-04.html
@@ -38,6 +38,11 @@ code used in the Austrian kataster e.g '1/S +' - https://expo/.survex.com/katast
 <kataster_number></kataster_number> <!-- (Either this or unofficial_number is required). Official number in Austrian kataster if one has been allocated  -->
 <unofficial_number>2023-mg-04</unofficial_number><!-- (Either this or kataster_number is required). Initial temporary cave ID used until kataster number is allocated e.g. '2012-DD-01'-->
 
+<entrance>
+  <entranceslug>1623-2023-mg-04</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></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. -->
 <survex_file></survex_file><!-- Name of top-level survey file for this cave. Relative to the 'loser' survex repository. So for most caves that's "caves/cavenum/cavnum.svx". (e.g. caves/204/204.svx -->
 <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. -->
diff --git a/cave_data/1623-2023-mg-05.html b/cave_data/1623-2023-mg-05.html
index 88962d103..e70ff7a83 100644
--- a/cave_data/1623-2023-mg-05.html
+++ b/cave_data/1623-2023-mg-05.html
@@ -15,6 +15,11 @@ the form documented at
 <a href="/handbook/survey/caveentry.html">handbook/survey/caveentry.html</a>
 <br>
 
+<entrance>
+  <entranceslug>1623-2023-mg-05</entranceslug>
+  <letter></letter>
+</entrance>
+
 <cave>
 <non_public>False</non_public><!-- 'False' or 'True'. True if the cave should only be visible to logged-in users. Caves are normally public, so enter 'False' unless you know otherwise. -->
 <caveslug>1623-2023-mg-05</caveslug><!--(Required). Internal I.D. used to refer to this cave in entrance data files. Typically the same as the filebase, e.g. '1623-195'  -->