I am writing a program manual in [mdoc(7)](https://man.openbsd.org/mdoc.7) . One example of my programs has this synopsis: > parsrc.sh [-lf] [CSV_file] [Taken from ShellShoccar-jpn/Parsrs/parsrc.sh](https://github.com/ShellShoccar-jpn/Parsrs/blob/master/parsrc.sh) For example if you run parsrc.sh -lf - then ` is a null string. If you run parsrc.sh -lfEOL - then is EOL`. I wish I could render it like:

parsrc.sh -lfs [CSV_file]

And I tried with \&:

.Dd $Mdocdate$
.Dt PARSRC.SH 1
.Os
.Sh NAME
.Nm parsrc.sh
.Nd CSV parser
.Sh SYNOPSIS
.Nm parsrc.sh
.Op Fl lf \& Ar s
.Op Ar CSV_file

Then I got this rendered: Or with mandoc -Thtml:

SYNOPSIS

  
    parsrc.sh
    [-lf -
      s] [CSV_file]

What is the appropriate way to realize it? Also this idea should be useful for example: > **file**s if **file** is an argument.