Why is the present simple is used? Shouldn't it be "will return"?
"Instead, special location services need to be designed, which may need to scale worldwide and be capable of servicing a billion users. We return to such services in Chap. 5."
Both the simple present and the future ( return or will return ) can be used to convey the idea of a definite arrangement for the future. Since the book is already published there is no chance that the information in Chapter 5 will not be there when you finally get to it. That's definite.
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Both the simple present and the future (return or will return) can be used to convey the idea of a definite arrangement for the future.
Since the book is already published there is no chance that the information in Chapter 5 will not be there when you finally get to it. That's definite.