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 36454650..a8063dd6 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
@@ -632,3 +632,6 @@ names the principle that settles it, and is cited as "design 47 G A-n".
   goes back to an earlier fingerprint, which the assigner computes itself; a kept data's `form` is read from the
   catalog entry's kept declarations (`catalogue.KeptDeclarations`). AS14's named seat and contribution edge, and
   AS17's ask of the operator, go to a design line.
+- **A-168** (E §33, design 46 approval mark §5; principle 3) For a marked wait on a module the runner does not serve,
+  the marks are the union of the newest entry of every followed branch; where the runner serves the module, its
+  served entry is added to that union. A mark is never lost.