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 26d1abc5..c355d937 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
@@ -369,3 +369,7 @@ the principle that settles it, cited as "design 47 G A-n".
   (the second reader release reads it from 1 to 8192, and since mesh-delivery #206 the grants part carries it onto the
   bucket). The manifest validator refuses an `approvals` state that lacks `key-ttl`, whose `ttl-seconds` is not 172800, or whose
   `max-mib` is above 64; with none declared the bucket takes the default 64 MiB.
+- **A-278** (A-179, A-186; principle 7, and code shared between modules lives in mesh-sdk) The seat-definition
+  function `AnswerSeat` takes is written once, in mesh-sdk's `seatlist` (the definition of a seat from the list a part
+  follows; none until the list is read, none for a seat it does not hold), and every holder passes it. A part that
+  serves a seat verb follows the seat list with its grant, as the pipeline runner and mesh-recovery now do.