QuickBook Chapter Numbers

Hi,

Some library documentations start with Chapter 1.0, for example: bimap, 
ICL, and also Boost.Geometry.

Many do have a proper chapter number. How is this number assigned? I 
cannot find the difference between our main QBK and for example that of 
Chrono, which has a proper chapter number.

Should we add a dependency in doc\Jamfile.v2 ?

Because I see this line <implicit-dependency>../libs/chrono/doc//chrono 
it seems logical that geometry (and some other libs) should be added 
there. Is then a chapter number assigned?

Or does it work otherwise?

Thanks, Barend