? about a section in Tidy manpage/help

I would like to get some clarification on what exactly this means.

Does this mean you can control your own markup changes? Beyond what is in the 
Options processing directives?

USAGE
Use --blah blarg for any configuration option "blah" with argument "blarg" 
Input/Output default to stdin/stdout respectively Single letter options apart 
from -f and -o may be combined as in: tidy -f errs.txt -imu foo.html For 
further info on HTML see http://www.w3.org/MarkUp For more information about 
HTML Tidy, visit the project home page at http://tidy.sourceforge.net. Here, 
you will find links to documentation, mailing lists (with searchable 
archives) and links to report bugs.

-- 
Jack