Is there a no-autoclose option?

[hymie0]

In cssh version 4.18 , the documentation tells me

    auto_close = 5
        Close terminal window after this many seconds. If set to 0 will
        instead wait on input from the user in each window before
        closing. See also --autoclose and --no-autoclose

However, I do not see any reference to a working "no-autoclose" option in the code.

$ cssh --no-autoclose
Unknown option: no-autoclose