diff --git a/syndicate/broker/tf.rkt b/syndicate/broker/tf.rkt
index fd5ce1c..bf17da7 100644
--- a/syndicate/broker/tf.rkt
+++ b/syndicate/broker/tf.rkt
@@ -75,6 +75,14 @@
          ;; interests generated by the way `during` is implemented,
          ;; only to general ones.
          ;;
+         ;; NB: There's a semantic difference here! In the
+         ;; commented-out version immediately below, we care about the
+         ;; start and stop events of the *facet*, so will get "absent"
+         ;; messages upon clean termination. In the other version,
+         ;; with separate asserted/retracted handlers, we will *not*
+         ;; get "absent" messages on clean termination, because the
+         ;; assertion is still there even as the actor terminates!
+         ;;
          ;; (during (from-broker node (present $who))
          ;;   (on-start (log-info "~a: ~a present" name who))
          ;;   (on-stop (log-info "~a: ~a absent" name who)))