To add a new item or keyword is easy.
Just create a .cat ASCII file describing the item and a
whatis file in your directory.
Then add your directory path
(and a title) in the variable %helps
(see also the README file
there). You can use the standard format of the scilab manual
(see the SCIDIR/man/subdirectories
and SCIDIR/examples/man-examples).
The Scilab LATEX manual is automatically obtained from the
manual items by a Makefile.
See the directory SCIDIR/man/Latex-doc.