diff --git a/docs/item-provenance-substrate.md b/docs/item-provenance-substrate.md
index f3ada0553..0bc310942 100644
--- a/docs/item-provenance-substrate.md
+++ b/docs/item-provenance-substrate.md
@@ -260,6 +260,7 @@ Every stat and wear reader goes through the instance:
 options below: facilities are built in place from raw materials, with a
 retooling cost per design switch; see the target.
 F1 is (c), one run-store ledger document (operator, 2026-09-17: "I like c").
+F4 is (a), quality per lot per role, rolled once and stored (operator, 2026-09-17).
 
 **F1. Lot storage: records versus embedded by value.** Blocks everything.
 - (a) Provenance embedded by value on each instance: a full DAG per unit. With