diff --git a/README.md b/README.md
index a83b1ae..df3ec0b 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,15 @@ does not belong.* Per-module code (a service's API client, its tool implementati
 create-a-resource adapter) lives **in the module**, never here — that coupling is exactly what
 turned the old SDK into constant maintenance and made every edit rebuild every module.
 
+**A seat's code is not here** (novox/hq ADR 0625, ADR 0627). mesh-sdk is the runtime every module uses (the bus
+connection, the tools bundle's runtime, state and its helpers) and a seat-neutral part two or more seats' clients or
+holders share (sending a file in parts, `go/parts`). A seat defined whole has its generated contract, and its client
+where callers share logic over it, in mesh-contracts (`go/seats/<seat>`, `go/clients/<seat>client`); the seat list is
+mesh-contracts' `go/seats`, which `catalogue` alone imports. The value layouts of seats not yet defined whole stay
+here until their domain moves, and no new seat-specific type is added. `packages_list_test.go` holds all of it:
+mesh-sdk imports no contracts module but the seat set in `catalogue`, names none of the seats with a client outside
+`catalogue`, and holds none of the packages that moved (`asks`, `asker`, `publish`).
+
 ## What is in it
 
 Five small areas, each a thing a module's `tools/` or `provisioner/` imports: