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diff --git a/TODO.md b/TODO.md
index 2fec5121..0c766204 100644
--- a/TODO.md
+++ b/TODO.md
@@ -165,6 +165,7 @@ new importers:
 
 ## Schema / Entity Fields
 
+- file+fileset "first seen" datetime
 - file type/scope/coverage: "fulltext", "abstract", etc
 - elastic transform should only include authors, not editors (?)
 - `translation_of` field on releases (or similar/general). `retraction_of` to a