diff --git a/docs/scrum4me-architecture.md b/docs/scrum4me-architecture.md
index 7a14d2b..58c593e 100644
--- a/docs/scrum4me-architecture.md
+++ b/docs/scrum4me-architecture.md
@@ -214,7 +214,7 @@ Scrum4Me is een desktop-first Next.js 16 webapplicatie die server-side wordt ger
 |---|---|---|---|
 | id | String (cuid) | PK | |
 | user_id | String | FK → users, not null | |
-| product_id | String | FK → products, nullable | Verplicht in UI en API; nullable voor backward compatibility |
+| product_id | String | FK → products, not null | Verplicht in UI en API; cascade delete wanneer product wordt verwijderd |
 | title | String | not null | |
 | done | Boolean | default false | |
 | archived | Boolean | default false | |