diff --git a/03-DESIGN/01-to-be/39-milestones/bus-and-switch.md b/03-DESIGN/01-to-be/39-milestones/bus-and-switch.md
index 9d507504..7f549ff3 100644
--- a/03-DESIGN/01-to-be/39-milestones/bus-and-switch.md
+++ b/03-DESIGN/01-to-be/39-milestones/bus-and-switch.md
@@ -521,3 +521,6 @@ written; they are cited as "design 39 bus-and-switch B*n*".
   short names only ("No licence has room for 4 machines", "<account> at 99% weekly"); the full list, the licence and
   the reset time go in the condition's detail. A cut at 60 characters with "…" stays as the last guard so a condition is
   never refused unsaid (P3).
+- **B40** (§34's `target`): true for the licence §26 would move a full licence's consumers to once it reaches its
+  threshold: the best licence with room now, whether or not any licence is at its threshold; so the tools say where
+  consumers go next (P4).