diff --git a/editions/tw5.com/tiddlers/concepts/TiddlerFields.tid b/editions/tw5.com/tiddlers/concepts/TiddlerFields.tid
index f72e55e80..21fab5461 100644
--- a/editions/tw5.com/tiddlers/concepts/TiddlerFields.tid
+++ b/editions/tw5.com/tiddlers/concepts/TiddlerFields.tid
@@ -19,6 +19,7 @@ The standard fields are:
 |`tags` |TagsField |<<lingo tags>> |
 |`type` |TypeField |<<lingo type>> |
 |`list` |ListField |<<lingo list>> |
+|`caption` |CaptionField |<<lingo caption>> |
 
 Other fields used by the core are: