diff --git a/03-DESIGN/01-to-be/47-milestones/G-22-lead-answers-2.md b/03-DESIGN/01-to-be/47-milestones/G-22-lead-answers-2.md
index 95464c74..3a3cc29f 100644
--- a/03-DESIGN/01-to-be/47-milestones/G-22-lead-answers-2.md
+++ b/03-DESIGN/01-to-be/47-milestones/G-22-lead-answers-2.md
@@ -147,3 +147,6 @@ the principle that settles it, cited as "design 47 G A-n".
   compared with the branch's newest revision: an acting rule widens when an entry's `Acts` gains a rule, or a rule's
   `on` now names more, or its `bound` is longer; a credential widens when an entry's manifest names an own secret or
   provision of a credential it did not name before; permissions come from `grants-for`.
+- **A-216** (amends A-181; principles 2 and 7) The builder's `build.ended` stream, kept last per subject, has no age
+  bound, only a cap in bytes: one end per fingerprint is the record of what was built, so a module unchanged for any
+  time is still known built after a restart.