[bug-alive] Option --help does not display essential information

[Bruno Haible]

Hi,

I installed GNU alive 2.0.4 (on top of GNU guile 3.0.5) today, because
I have a flaky internet connection and the homepage [1] says
  "It functions similarly to ‘ping -n -i PERIOD HOST’"

Then I run

  $ ./alive --help
  Usage: alive [option]

  Options:
       --help             Display this message.
       --version          Display version and license info.

  Report bugs to: <bug-alive@gnu.org>
  GNU Alive home page: <https://www.gnu.org/software/alive/>
  General help using GNU software: <https://www.gnu.org/gethelp/>

So, the first impression is that there is no way to specify the HOST.

And indeed, this is confirmed:

  $ ./alive 8.8.8.8
  alive: Unexpected argument (try --help)

  $ ./alive
  /bin/sh: 1: xdgdirs: not found
  alive: 2022-01-01 19:06:36 restart (pid 870818)

  (2022-01-01 19:06:36 period) unspecified, using random value
  (2022-01-01 19:06:36 hosts) unspecified, falling back to localhost
  localhost | 127.0.0.1: icmp_seq=1 ttl=64 time=0.043 ms
  (71)    2022-01-01 19:06:36
          2022-01-01 19:07:47

Then I turned to the manual [2], and this sentence explained it all:

  ‘alive’ takes no arguments, and instead reads configuration
  information from files in the config directory, by default
  $HOME/.alive.d/.

Could this sentence please be added to the --help output? It would
help newbies a lot.

Bruno

[1] https://www.gnu.org/software/alive/
[2] https://www.gnu.org/software/alive/manual/alive.html