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 accd1134..6830bea5 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
@@ -608,3 +608,7 @@ names the principle that settles it, and is cited as "design 47 G A-n".
   build, carrying `outcome` (done or failed) and, when failed, `error`; the assigner's hold says "failed: <error>"
   from it and "is being built" while no `build.ended` of that fingerprint is heard. The assigner never reads the
   builder's `builds` bucket; its read there (put.go:85, the manifest's `reads`) goes.
+- **A-163** (§543, §544; principles 7 and 8) The asker in an ask's accept subject is the asking seat's own name
+  (`mesh-pipeline-runner`, `mesh-catalog`, `mesh-wants`, `mesh-builds`, `mesh-delivery-checker`), not a nickname, so
+  steprun checks it against the callers the build seat's definition lists, read from the seat list; no table of its
+  own and no name map. A body's kind is the word the seat definition gives; a queue keeps its own name.