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 d21c2fae..ef4cbfa4 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
@@ -240,3 +240,8 @@ the principle that settles it, cited as "design 47 G A-n".
 - **A-241** (§712, A-234; principle 3) The validation's `seats` are the branch's revision's seat definitions (A-234)
   with the merges' changed definitions laid over them, so a revision that touches no definition is still judged
   against the whole seat list.
+- **A-242** (§512, §186, §376, §378; principles 1, 2 and 7) The assigner's `difference` fills `Tiers` and each
+  change's `after` (the kind of edge that orders it), computed in its compare; the view orders nothing itself. A
+  `view_tiers` call for a source revision compares the kept assignment revision whose catalog for that branch is that
+  source revision with the revision kept before it. The view keeps a state `waits` (key owner, step, node, module)
+  written by its process from every part's `wait-held` and `wait-ended` it consumes, read by its own read tool.