TurboTax Help for Form 8615 is missing some useful information about Parent Long-term gain

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In the TurboTax Help for "Form 8615 - Tax for Certain Children who have unearned income" the section on "Parent's Schedule D and Investment Interest Smart Worksheet" should mention that if the Parent's Long-term gain is zero of a loss  line B should be left blank.  This information is in the interview, but it is missing from the help.  Thanks.