diff --git a/pkgs/racket-pkgs/racket-doc/scribblings/reference/futures-logging.scrbl b/pkgs/racket-pkgs/racket-doc/scribblings/reference/futures-logging.scrbl
index 8a06c25acc..f72b3ee9cb 100644
--- a/pkgs/racket-pkgs/racket-doc/scribblings/reference/futures-logging.scrbl
+++ b/pkgs/racket-pkgs/racket-doc/scribblings/reference/futures-logging.scrbl
@@ -18,7 +18,7 @@ a data value that is an instance of a @racket[future-event]
 @tech{prefab} structure:
 
 @racketblock[
-(struct future-event (future-id proc-id action time)
+(struct future-event (future-id proc-id action time prim-name user-data)
   #:prefab)
 ]