>> You can use .txt files to do this. Simply type ocamldoc
>> comment  (without (** *)) in a file.txt file and pass it to
>> ocamldoc like any  .ml or .mli file. This will be considered
>> as a File module and you can refer to it by {!File} from any
>> ocamldoc comment.
> 
> Excellent!  Thanks for the tip.  Incidentally, the 3.10 version
> of Ocamlbuild does not support the generation of documentation
> from implementation files.  Will 3.11 fix this?

It works for me with the 3.10.1. I just tried to write a file test.ml, 
and a file truc.odocl with "Test" in it, and then ran ocamlbuild :
	ocamlbuild truc.docdic/index.html
And it worked. Or maybe I didn't understand what you want?

-- 
Romain Bardou