diff --git a/workplans/FLEX-WP-0024-decision-envelope-authenticity.md b/workplans/FLEX-WP-0024-decision-envelope-authenticity.md
index 467248b..e8b187c 100644
--- a/workplans/FLEX-WP-0024-decision-envelope-authenticity.md
+++ b/workplans/FLEX-WP-0024-decision-envelope-authenticity.md
@@ -389,6 +389,7 @@ status: wait
 priority: high
 needs_human: true
 decision_id: "4fab263d-686b-4a06-9cea-8df619c87c03"
+blocking_reason: "Founder go/no-go (entity, window, expiry, executor) for the attended R2 signer rollout, after Platform custody exists under CCR-2026-0050"
 ```
 
 Founder go/no-go for one attended window, after Platform custody exists under