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 e53dfecc..606575ef 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
@@ -364,3 +364,8 @@ names the principle that settles it, and is cited as "design 47 G A-n".
   or bucket of its own; the trunk's `modules`, `manifests` and graph stay the trunk's alone. The trunk stays the
   mesh-wide branch `main` (ADR 0666's default watched branch), named once in the indexer; a registration's own first
   branch decides only which of its branches it delivers from.
+- **A-94** (§379, §525, §526; principle 1, a part asks for another's data or hears its events) The assigner hears the
+  builder's `build.ended` event (§379 names it) and reads no builder state such as `build-log`. A want for a trunk
+  revision's entry takes `version` and its parts' digests from the `version-released` whose `source` is that revision;
+  a build `build.ended` marks kept (its keeping node) is a kept build, its parts and `kept-on` from that event; a build
+  of another watched branch is the one whose `build.ended` names that branch, its parts from that event.