Is there a reason the "-v/verbose" switch is not printed with pg_dumpall --help

postgres(at)pgbox:/u01/app/postgres/local/dmk/ [PG961] pg_dumpall -V
pg_dumpall (PostgreSQL) 9.6.1
postgres(at)pgbox:/u01/app/postgres/local/dmk/ [PG961] pg_dumpall --help
pg_dumpall extracts a PostgreSQL database cluster into an SQL script file.

Usage:
pg_dumpall [OPTION]...

General options:
-f, --file=FILENAME output file name
-V, --version output version information, then exit
--lock-wait-timeout=TIMEOUT fail after waiting TIMEOUT for a table lock
-?, --help show this help, then exit

Options controlling the output content:
-a, --data-only dump only the data, not the schema
-c, --clean clean (drop) databases before recreating
-g, --globals-only dump only global objects, no databases
-o, --oids include OIDs in dump
-O, --no-owner skip restoration of object ownership
-r, --roles-only dump only roles, no databases or tablespaces
-s, --schema-only dump only the schema, no data
-S, --superuser=NAME superuser user name to use in the dump
-t, --tablespaces-only dump only tablespaces, no databases or roles
-x, --no-privileges do not dump privileges (grant/revoke)
--binary-upgrade for use by upgrade utilities only
--column-inserts dump data as INSERT commands with column names
--disable-dollar-quoting disable dollar quoting, use SQL standard quoting
--disable-triggers disable triggers during data-only restore
--if-exists use IF EXISTS when dropping objects
--inserts dump data as INSERT commands, rather than COPY
--no-security-labels do not dump security label assignments
--no-tablespaces do not dump tablespace assignments
--no-unlogged-table-data do not dump unlogged table data
--quote-all-identifiers quote all identifiers, even if not key words
--use-set-session-authorization
use SET SESSION AUTHORIZATION commands instead of
ALTER OWNER commands to set ownership

Connection options:
-d, --dbname=CONNSTR connect using connection string
-h, --host=HOSTNAME database server host or socket directory
-l, --database=DBNAME alternative default database
-p, --port=PORT database server port number
-U, --username=NAME connect as specified database user
-w, --no-password never prompt for password
-W, --password force password prompt (should happen automatically)
--role=ROLENAME do SET ROLE before dump

If -f/--file is not used, then the SQL script will be written to the standard
output.

Report bugs to <pgsql-bugs(at)postgresql(dot)org>.

It is mentioned in the documentation but not in the help output

Regards
Daniel