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 b88f19f9..83ea68e6 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
@@ -457,3 +457,7 @@ names the principle that settles it, and is cited as "design 47 G A-n".
   `wait-held` (§541) as every wait does.
 - **A-114** (§693, A-61; principle 7) The seat `mesh-wants`' `wanted` stream keeps the last message per subject with no
   age limit (`max-age-days: 0`): it is each want's last word, read whole at a start.
+- **A-115** (A-107, A-109, A-110; principle 7; corrects both) `serves` is a field of a process itself, beside its
+  `bus`, not inside it: the grants part adds the serve subjects to whichever account that process runs on, the
+  module's own when it declares no `bus`, so a process keeps hearing what it heard. Only a seat's verbs move to the
+  process: a module tool such as `builder_build` stays its tools bundle's (A-87).