diff --git a/docs/hot-plug-matrix-plan.md b/docs/hot-plug-matrix-plan.md
index 21106fc..1b22582 100644
--- a/docs/hot-plug-matrix-plan.md
+++ b/docs/hot-plug-matrix-plan.md
@@ -1,5 +1,12 @@
 # The hot-plug matrix: unplug anything, replug anywhere
 
+*Status: COMPLETE, 2026-08-09, same day — H1..H5 all green, full suite 124/124.
+The predicted cascade bug was real and found by H2: `tearDownPort` did not recurse
+into a hub yanked from a root port, so its subtree stayed live against vanished
+hardware and the replugged hub found its port occupied; fixed by mirroring
+`tearDownHubDevice`'s children-first recursion (77e7001). Every other cell passed
+against the establishment-track machinery unchanged.*
+
 *2026-08-09. The requirement, verbatim: "i want to be able to unplug devices and
 plug them back in, in any order and on any hub." The machinery exists end to end —
 per-device driver processes, cascading teardown (`tearDownHubDevice` recurses a