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 9a409873..55ce7387 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
@@ -571,3 +571,6 @@ names the principle that settles it, and is cited as "design 47 G A-n".
 - **A-152** (§472, §492; principles 3 and 7) The toolchain's `digest` is the sha256 of the toolchain program the build
   module runs (the `go` or `node` it finds), computed at its start and again when the toolchain's version changes; no
   field is added to the provision.
+- **A-153** (§559, E §1; principles 7 and 8) The tool runner resolves a `deliver: new` subscription's key
+  `<emitter>.<event>` to its subjects with mesh-sdk's `buscompose.EventSubjects`, the one rule from an event name to
+  its subjects (a seat's event subject or the module's); a pattern with a wildcard is refused with `{error}`.