+\dt \cw{--ps}[\cw{=}\e{filename}]
+
+\dd Makes Halibut generate an output file in PostScript format. If
+the optional \e{filename} parameter is supplied, the PostScript
+output file will be given that name. Otherwise, the name of
+the output PostScript file will be as specified in the input files,
+or \c{output.ps} if none is specified at all.
+
+\dt \cw{--pdf}[\cw{=}\e{filename}]
+
+\dd Makes Halibut generate an output file in PDF format. If
+the optional \e{filename} parameter is supplied, the PDF
+output file will be given that name. Otherwise, the name of
+the output PDF file will be as specified in the input files,
+or \c{output.pdf} if none is specified at all.
+