diff --git a/collects/scribblings/raco/decompile.scrbl b/collects/scribblings/raco/decompile.scrbl
index 24184516f6..cacf906532 100644
--- a/collects/scribblings/raco/decompile.scrbl
+++ b/collects/scribblings/raco/decompile.scrbl
@@ -132,6 +132,10 @@ Consumes the result of parsing bytecode and returns an S-expression
 
 @defmodule[compiler/zo-marshal]
 
+@defproc[(zo-marshal-to [top compilation-top?] [out output-port?]) void?]{
+
+Consumes a representation of bytecode and writes it to @racket[out].}
+
 @defproc[(zo-marshal [top compilation-top?]) bytes?]{
 
 Consumes a representation of bytecode and generates a byte string for