diff --git a/media/js/readme.txt b/media/js/readme.txt
index 339dfd7..36ebcd4 100644
--- a/media/js/readme.txt
+++ b/media/js/readme.txt
@@ -12,6 +12,16 @@ http://localhost:8000/pathsreport to check
 JSLIB_ROOT	/mnt/c/EXPO/troggle/media/jslib	
 JSLIB_URL	/javascript/	
 
+Troggle uses  CaveView in to display survex .3d files.
+On the server CaveView is loaded in the proper Debian place for them, not part of the troggle 
+code tree. So there is no copy of them here.
+
+There are JS snippets loaded from within the template .html files. These are in the troggle 
+code tree repo.
+
+CodeMirror loader IS in the troggle repo, and is loaded from templates/html_editor>scripts.css
+and  the CodeMirror JS IS in the troggle repo in media/js/CodeMirror
+
 jquery seems to have been only used for a popup menuing system used for all the troggle reports
 which was deleted by philip sargent as confusing and unnecessary in Spring 2020.