tmux copy-mode -u, useless or useful?

Tmux comes with a key binding for both copy-mode and copy-mode -u. The first is straight forward, you can navigate through the window history, highlight something and place it into your tmux buffer. I was curious about what the -u flag was for, and the man page says:

The -u option scrolls one page up.

So the -u option just places you into copy-mode one page up. Useless! Or wait, maybe that's something I want...

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