@code{texi} (the default). @command{lilypond-book} usually figures this
out automatically.
+Note that the @code{texi} document type produces a DVI file; to
+convert a texinfo document to @code{html}, you should use the additional
+format @code{texi-html} instead of @code{texi} to convert lilypond
+fragments to PNG images.
+
@item @option{--default-music-fontsize=@var{sz}pt}
Set the fontsize to use for LilyPond if no fontsize is given
as option.