diff --git a/pkgs/racket-doc/scribblings/reference/custom-write.scrbl b/pkgs/racket-doc/scribblings/reference/custom-write.scrbl
index e3ed413ee0..aed7a400f7 100644
--- a/pkgs/racket-doc/scribblings/reference/custom-write.scrbl
+++ b/pkgs/racket-doc/scribblings/reference/custom-write.scrbl
@@ -108,7 +108,7 @@ property, @racket[#f] otherwise.}
 
 
 @defproc[(custom-write-accessor [v custom-write?])
-         (custom-write? output-port? boolean? . -> . any)]{
+         (custom-write? output-port? (or/c boolean? (integer-in 0 1)) . -> . any)]{
 
 Returns the custom-write procedure associated with @racket[v].}