pdfmod doesn't respond to -h and --help argument and has no manpage

There's no (easy) way to figure out how to use `pdfmod` on the command line.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: pdfmod 0.9.1-8
Uname: Linux 4.5.7-040507-generic x86_64
NonfreeKernelModules: openafs
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jun 14 21:37:41 2016
InstallationDate: Installed on 2013-10-17 (971 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
PackageArchitecture: all
SourcePackage: pdfmod
UpgradeStatus: Upgraded to xenial on 2016-03-04 (101 days ago)