Credits and deductions

The below is copied directly from the Turbo Tax information section, this is why I am confused:

Child Care Expense Deduction
Child care expenses are usually claimed by the spouse with the lowest net income, or by the single parent with whom the children in care reside. Benefits received from the EI program are considered earned income for tax purposes, so EI benefits have no effect on the claim for child care expenses . Since EI benefits don't completely replace employment earnings, the reduction of earned income may affect the earning relationship between spouses, which also changes which spouse should claim child care expenses. Child care expenses are reported on form T778, with the allowable deduction transferred to line 214 of your federal tax return.