How to load a .top file in .ocamlinit file for utop

Hi !
I found in RealWorldOcaml that one can load some .top file for pretty printing utilities:

The package (which you should have loaded by default in your .ocamlinit file) loads in printers for the Core extensions already, so you don’t need to do anything special to use the s-expression printer.

ocamlfind list | grep top find effectively a package. I tried modifying my .ocamlinit file to load, but I did not succeed. (and I did not find something on it online, even if it must be documented in utop docs…) How do we do this ?

Here is my .ocamlinit file:

(* Added by OPAM. *)
let () =
  try Topdirs.dir_directory (Sys.getenv "OCAML_TOPLEVEL_PATH")
  with Not_found -> ()

(* ## added by OPAM ... ## you can edit, but keep this line *)
#use "topfind";;
(* ## end of OPAM user-setup addition for ocamltop / base ## keep this line *)
#require "core";;

Thanks !

[EDIT] : my bad, it was so simple: # require "". Solution found there.