What on form 1040x do I need to correct if my child who filed a tax return forgot to check the box “someone can claim me as a dependent?”

He made minimal money but wondering what adjustments I need to help him make on Form 1040x, if any. I know we need to send in his tax forms from 2024 but no where on Form 1040x is there a box to check to say that someone can claim him as a dependent.