man.txt

.Dd $Mdocdate$
.Dt optional 1
.Os
.Sh NAME
.Nm optional
.Nd optional argument
.Sh VERSION
0.0.0
.Sh SYNOPSIS
optional (-h|--help) | --version | ARGUMENT
.Sh SETTINGS
  Show this help text
  switch: -h|--help

  Output version information: 0.0.0
  switch: --version

  Argument
  argument: ARGUMENT
  

.Sh OPTIONS
  -h|--help Show this help text               
  --version Output version information: 0.0.0 
  ARGUMENT  Argument