diff --git a/03-DESIGN/01-to-be/47-milestones/G-20-lead-answers.md b/03-DESIGN/01-to-be/47-milestones/G-20-lead-answers.md
index 549dcf95..8ccedd8c 100644
--- a/03-DESIGN/01-to-be/47-milestones/G-20-lead-answers.md
+++ b/03-DESIGN/01-to-be/47-milestones/G-20-lead-answers.md
@@ -249,3 +249,8 @@ names the principle that settles it, and is cited as "design 47 G A-n".
   failing check's time, also when it first rests on `conditions-unread`; while the keeper has not answered, a first
   failing check holds as the settle and becomes `conditions-unread` only after it, and a standing wait keeps its cause
   while a new read is out.
+- **A-64** (§681, A-45; principles 7 and 8) As built in mesh-catalog 47aaee12: a chunk's body is `{n, of, data}`; a
+  restore's act id is the id of the request the bundle hands the keeper; `verify` answers `accepted` with that id and
+  says no event; an unprotected snapshot's restore refuses nothing further; each chunk is acknowledged by a request,
+  since the runtime answers only calls with a reply. One change: `snapshots-filling` takes an existing scope word,
+  scope `module`, id `nats.snapshots`.