Comment 2 for bug 631619

That wording would be a *little* better for this situation, because it refers to installing at all -- but "new sources" would still be a bit of a non-sequitur. And I think it would be worse for the case where you are making changes in Software Sources, because it would suggest that you're about to accidentally install new stuff when you aren't.

I wish this could be fixed with just a wording change, but I don't think it can be.