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 364c9604..bdb578de 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
@@ -97,3 +97,5 @@ names the principle that settles it, and is cited as "design 47 G A-n".
   form of their own; `stalled` answers the records whose open wait is past its bound, with that wait. The pull-request
   handlers and their effects stay only where G-3 §158 names what the gate owes the forge, rebuilt on the records; the
   rest goes with the state table.
+- **A-25** (§518, A-21; principle 3) A session put loses nothing a one-call put keeps: its first chunk carries the put's
+  `description`.