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I'm in the process of entering my ESPP sale details and similar to the original author of this post, my W-2 doesn't include the compensation income for this sale.

I'm entering the compensation income manually and see the following in the help message:

"Compensation income is reported on line 1 of Form 1040 along with wages. Usually, employers include this compensation in box 1 of Form W-2. If they did not, we'll add it to your regular wages."

How will TurboTax know whether or not my employer included this compensation income in my W-2? I don't see any options to let TurboTax know that this isn't included.