I have a question about description of elisp function 'modify-frame-parameters frame alist' in the lispref manual(http://git.savannah.gnu.org/cgit/emacs.git/tree/doc/lispref/frames.texi#n1286).

The manual says,

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Some parameters are only meaningful for frames on certain kinds of display (@pxref{Frames}).  If @var{alist} includes parameters that are not meaningful for the @var{frame}'s display, this function will change its value in the frame's parameter list, but will otherwise ignore it.

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So, my question is,

Either 'not' or 'otherwise' is not necessary, isn't it?

(Because I learned English several decades ago, I am not confident this, sorry.)

Thanks.