Usage of pg_waldump

Hi,

I am confused with the Usage of pg_waldump (or pg_xlogdump).

The syntax is known as,

  pg_waldump [OPTION]... [STARTSEG [ENDSEG]]

Mean that, it could work with no arguments.

But the "no arguments specified" ERROR will be returned in that case.

  $ pg_waldump

  pg_waldump: no arguments specified

  Try "pg_waldump --help" for more information.

I wonder it should be,

  pg_waldump { OPTION... [STARTSEG [ENDSEG]] } | { [OPTION]... STARTSEG [ENDSEG] }

Have any comments?

Thanks,

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Dang Minh Huong