diff --git a/racket/syndicate/examples/actor/example-assertion-spike.rkt b/racket/syndicate/examples/actor/example-assertion-spike.rkt
new file mode 100644
index 0000000..693a17d
--- /dev/null
+++ b/racket/syndicate/examples/actor/example-assertion-spike.rkt
@@ -0,0 +1,21 @@
+#lang syndicate/actor
+
+(require/activate syndicate/drivers/timer)
+
+(actor #:name 'main
+       (on (message 'trigger)
+           (actor* #:name 'asserter
+                   (assert! 'up)
+                   (send! 'done)))
+       (during/actor 'up
+                     #:name 'up
+                     (on-start (printf "starting\n"))
+                     (on-stop (printf "stopping\n"))))
+
+(actor* #:name 'triggerer
+        (until (asserted (observe 'trigger)))
+        (send! 'trigger)
+        (until (message 'done))
+        (printf "got done\n")
+        (send! (set-timer 'timer 500 'relative))
+        (until (message (timer-expired 'timer _))))