One side benefit to the title case approach is that references to the button in documentation and…
Kit Grose

Ah, good point. I didn’t think about that.

One thing we do for Dropbox documentation is to bold the UI term when referring to it in help instructions. So in our style, we’d say:

Click Add or remove backup disk to add more…

But I know bolding isn’t always possible, and things can look pretty ugly if you have a lot of bold scattered throughout the instructions.

In most cases, this approach seems to work for us, and I think the bolding does a good job of making those terms stand out while scanning the instructions.

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