diff --git a/packages/mosaic/framework/tools/wake/detector.sh b/packages/mosaic/framework/tools/wake/detector.sh
index 36d6fe90..fd5f4389 100755
--- a/packages/mosaic/framework/tools/wake/detector.sh
+++ b/packages/mosaic/framework/tools/wake/detector.sh
@@ -531,7 +531,13 @@ cmd_run() {
     [ "$once" -eq 1 ] && break
     # Close the detector lock fd in the sleep child; otherwise an orphaned sleep
     # keeps the single-instance flock (fd 9, taken at exec 9> above) alive after
-    # the detector parent dies, and no replacement instance can ever acquire it.
+    # the detector parent dies. The lock is non-blocking (`flock -n`, above), so
+    # for as long as that sleep survives a replacement instance is REFUSED and
+    # exits rather than queueing. The window is BOUNDED by one poll interval
+    # (WAKE_DETECTOR_INTERVAL, default 30s): when the orphaned sleep exits the
+    # last copy of the fd closes and the next start succeeds. The cost is a
+    # restart window in which every supervisor retry fails — not a lock that
+    # nothing can ever reclaim.
     # `9>&-` closes ONLY the child's copy — the parent's lock is unaffected.
     sleep "$interval" 9>&-
   done