diff --git a/collects/scribblings/reference/struct.scrbl b/collects/scribblings/reference/struct.scrbl
index 156cf2d54d..7e3638c78f 100644
--- a/collects/scribblings/reference/struct.scrbl
+++ b/collects/scribblings/reference/struct.scrbl
@@ -455,6 +455,7 @@ of the structure type.
 (define-struct cat (name) #:prefab)
 (define-struct (cute-cat cat) (shipping-dest) #:prefab)
 (make-cute-cat "Nermel" "Abu Dhabi")
+(prefab-struct-key (make-cute-cat "Nermel" "Abu Dhabi"))
 ]}