The only way to indicate this is to also enter
“QCD” next to line 4b on Form 1040 to indicate a qualified charitable distribution.
That means you have to include Form 1040 with your amendment which is ordinarily not done.
If you attach Form 1040 to your paper 1040-X, be sure to
enter “Attachment to Form 1040-X—Copy Only—Do Not Process” at the top of the form.
