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 c355d937..b8c14522 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
@@ -373,3 +373,6 @@ the principle that settles it, cited as "design 47 G A-n".
   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.
+- **A-279** (A-236, §715; principles 1 and 7) A group member's `base` is its pull request's base branch as the forge
+  message names it (`forgemsg` `base`, said when the pull request is opened or pushed), filled when the gate hears that
+  message, so it is known before any take-in; the take-in's branch never stands in for it.