What does (*s mean in OCaml?

Question

I'm looking at an OCaml source file that begins like this

(*s Implementation of n-ary trees. (Some code is borrowed from the OCaml
    standard library, which is copyright 1996 INRIA.) *)

What does (*s mean? I thought the s might be a typo, but it appears in several files, so it must be deliberate.

Answer 1

(*s显然由ocamlweb使用 ，这是OCaml的识字编程工具（请参阅https://www.lri.fr/~filliatr/ocamlweb/ocamlweb-1.38-man.html ）。

Answer 2

There is no such thing in ocaml.

Everything inside (* *) are comments.

May be it must be a convention used by them.