And we're going to form an H bond. So that is a hydrogen bond donor. Now let's take a look at this Carbonal group of this same amino acid. So we have the oxygen that is more electronegative than the carbon and it develops a partial negative charge. And so if an H atom that has a partially positive charge is found in close proximity on the other side of this partially negative oxygen, then we have a bond that is formed and that bond is a hydrogen bond. And so this oxygen is said to be an acceptor of that partially positive H atom.