Packaging system: Package documentation in the *Help* buffer

[H. Dieter Wilhelm]

Hello Emacs

The Elisp manual (GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, GTK+
Version 3.22.30) of 2019-12-14) states that a README in the content
directory of a package will be used as a package description for C-h P.

Please check

  (info "(elisp) Multi-file Packages").

Yet this isn't working!  By looking at other packages It seems that
there must be a file `PACKAGE-NAME-readme.txt' BELOW the content
directory to get a long description in the package help.

Is this a bug in package.el or is it an oversight in the Elisp manual?

Thanks
        Dieter

-- 
Best wishes
H. Dieter Wilhelm
Zwingenberg, Germany