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 316acd99..397e93f5 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
@@ -387,3 +387,6 @@ names the principle that settles it, and is cited as "design 47 G A-n".
   unit and integration on the build seats. With the candidate coming that way, the builder's watch of the gate's
   `source` for candidate base merges goes. A kind-3 dependency's `part` is the entry's kind-3 edge, as built in
   2dc51626.
+- **A-98** (§297; principles 3 and 7) The node agent gains one act, `Env.Stop`: it stops a module's units and containers
+  and removes nothing, so a revert's data survives; the revert stops the newer build with it, asks `restore-kept`, and
+  then `Apply` starts the reverted build. `Remove` keeps its meaning.