Specifying a package in Module declaration

[ehud.behar at protonmail.com]

I want to write a module that calls for the geometry package and inserts page layout commands to my document, once it is chosen to be used.

Of course, I can do

AddToPreamble
\usepackage{geometry}
\geometry{..page layout commands go here..}
EndPreamble

But I prefer the \usepackage{}` command to be inserted automatically, just like

Requires packagename

does.

I read in the Customization manual that there is this optional argument for the Module specification (section 5.3.2. The Module declaration), for example:

#\DeclareLyXModule[endnotes.sty]{Endnotes}

It doesn't add to my preamble the \usepackage{endnotes} command automatically. If so, then what is good for?
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