What type of footnotes do you need to attach?
Generally, the information you enter from the K-1(s) you receive are dispersed throughout your personal income tax return; the K-1, itself, does not get filed with your return - you retain it for your records.
No, you cannot add any addendum if you intend on electronically filing. If you file by mail, you can include additional documents, but this is NOT recommended. What do you need to explain? If the IRS wants further information, they will request it. @mrKlein
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