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 3e1ddf5e..3e013d70 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
@@ -161,3 +161,6 @@ the principle that settles it, cited as "design 47 G A-n".
   channel's calls (ask, read the warrant, record) as an interface its caller passes, which `operatorchannelclient`
   implements over the generated types, so no form is copied and no import cycle arises. The seat client's
   `wait: held` lives with `process.Conn`'s call, as there is no `go/seats`.
+- **A-220** (§71, §441, A-167, A-207, A-215; principle 7) The serving parts `widens` compares are the holders of the
+  seats `mesh-pipeline-runner` (the runner), `mesh-catalog` (step detection), each step's own seat (the build seats
+  that run lint and tests) and `node-engine` (the composer, A-167), found by `seatlist.HolderOf`.