HEADER [ boolean ] not allowed in COPY ... FROM statement

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/11/sql-copy.html
Description:

> psql --version ;
psql (PostgreSQL) 11.2
> initdb --version ;
initdb (PostgreSQL) 11.2

The boolean parameter is not allowed in the statement:

# COPY table_name FROM '/srv/database/pg_dumps/file.csv' WITH CSV HEADER
true DELIMITER ',' QUOTE '"' ;
ERROR: syntax error at or near "true"
LINE 1: ...pg_dumps/file.csv' WITH CSV HEADER true DELIM...

# COPY table_name FROM '/srv/database/pg_dumps/file.csv' WITH CSV HEADER
'true' DELIMITER ',' QUOTE '"' ;
ERROR: syntax error at or near "'true'"
LINE 1: ...pg_dumps/file.csv' WITH CSV HEADER 'true' DEL...
^
# COPY table_name FROM '/srv/database/pg_dumps/file.csv' WITH CSV HEADER 1
DELIMITER ',' QUOTE '"' ;
ERROR: syntax error at or near "1"
LINE 1: ...pg_dumps/file.csv' WITH CSV HEADER 1 DELIMITE...

# COPY table_name FROM '/srv/database/pg_dumps/file.csv' WITH CSV HEADER
DELIMITER ',' QUOTE '"' ;
COPY 63