An updated command line usage description can be obtained with:

autocrypt -h

At the time of writing the output is:

usage: autocrypt [-h] [–version] [-d] [-m PGPHOME] [-l] [-n NEWACCOUNT]
[-r NEWPEER] [-a] [-g] [-u] [-p PASSPHRASE] [-c] [-f FROMH] [-t TO] [-s SUBJECT] [-b BODY] [-e PE] [-i INPUT] [-o OUTPUT]
optional arguments:
-h, --help show this help message and exit
--version show program’s version number and exit
-d, --debug Set logging level to debug
-m PGPHOME, --pgphome PGPHOME
 Path to Autocrypt home, ~/.pyac by default
-l, --list List account and peers
 Email address for the new account. It will also generate new OpenPGP keys.
-r NEWPEER, --newpeer NEWPEER
 Email address for the new peer.
-a, --genac Generate Autocrypt Email. Use -f, -t, -s, -b, or the defaults will be use
-g, --genag Generate Autocrypt Gossip Email
-u, --genas Generate Autocrypt Setup Email
 Passphrase to generate an Autocrypt Setup Email
-c, --genasc Generate Autocrypt Setup Code
-f FROMH, --fromh FROMH
 Email sender address and OpenPGP UID
-t TO, --to TO Email recipient addresses separatade by comma
-s SUBJECT, --subject SUBJECT
 Subject for the Autocrypt Email
-b BODY, --body BODY
 Body for the Autocrypt Email
-e PE, --pe PE prefer-encrypt for the Autocrypt Email
-i INPUT, --input INPUT
 Path to the Email to parse, by default: /home/user/_my/code/mailencrypt- related/pyac/tests/data/example-simple-autocrypt- pyac.eml
-o OUTPUT, --output OUTPUT
 Path to store the Autocrypt Email, by default: /tmp/output.eml

An useful argument when reporting bugs is -d.