Cygwin df -l option has wrong sense?

According to df --help, the -l option means to list only local drives.
But in practice it seems to do the exact opposite:

    $ df -k /cygdrive/c/cygwin
    Filesystem           1k-blocks      Used Available Use% Mounted on
    C:\cygwin             39070048  32015012   7055036  82% /

    $ df -k -l /cygdrive/c/cygwin
    Filesystem           1k-blocks      Used Available Use% Mounted on

    $ df -k //handel/d
    Filesystem           1k-blocks      Used Available Use% Mounted on
    x:                     4811432   2402244   2409188  50% /cygdrive/x

    $ df --help
    Usage: df [OPTION]... [FILE]...
    Show information about the filesystem on which each FILE resides,
    or all filesystems by default.
    [...]
      -l, --local           limit listing to local filesystems
    [...]
    Report bugs to <[email protected]>.

    $ uname -a
    CYGWIN_NT-5.1 DOYLE 1.5.10(0.116/4/2) 2004-05-25 22:07 i686 unknown unknown Cygwin

Have I misunderstood?

luke