diff --git a/scribblings/cs19.scrbl b/scribblings/cs19.scrbl
index 468fcfd..3ad1c10 100644
--- a/scribblings/cs19.scrbl
+++ b/scribblings/cs19.scrbl
@@ -214,6 +214,9 @@ Here are a collection of web-world demos:
 @itemize[
 @item{@link["http://hashcollision.org/whalesong/examples/attr-animation/attr-animation.html"]{attr-animation.html} [@link["http://hashcollision.org/whalesong/examples/attr-animation/attr-animation.rkt"]{src}]  Uses @racket[update-view-attr] and @racket[on-tick] to perform a simple color animation.}
 
+@item{@link["http://hashcollision.org/whalesong/examples/boid/boid.html"]{boid.html} [@link["http://hashcollision.org/whalesong/examples/boid/boid.rkt"]{src}]  Uses @racket[update-view-css] and @racket[on-tick] to perform an animation of a flock of @link["http://en.wikipedia.org/wiki/Boids"]{boids}.}
+
+
 @item{@link["http://hashcollision.org/whalesong/examples/dwarves/dwarves.html"]{dwarves.html}
 [@link["http://hashcollision.org/whalesong/examples/dwarves/dwarves.rkt"]{src}]
 Uses @racket[view-show] and @racket[view-hide] to manipulate a view.  Click on a dwarf to make them hide.