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 50be45d5..889bf7f4 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
@@ -193,3 +193,7 @@ names the principle that settles it, and is cited as "design 47 G A-n".
   read as the others are; `assigner_release` with `how` releases an outside wait and without it ends a put as today;
   a want held for M's own network says `RuleNotHeld` with words naming the open `machine.<M>.network`. As the
   developer proposed on mesh-delivery feat/47-G-outside5.
+- **A-49** (§518, §576; principle 7) A put or get session's bound is the call's bound the runner already uses,
+  `launch.CallTimeout` (30 seconds), counted from its first chunk; a session also ends when its bundle's channel closes
+  (the child's exit), as §518 says. The runner answers `mesh/capabilities` with `{words}` (§576), so a bundle's
+  capability check passes.