Jamieson, Fausset and Brown on Revelation 22:20

20. Amen. Even so, come--The Song of Solomon (So 8:14) closes with the same yearning prayer for Christ's coming. A, B, and Aleph omit "Even so," Greek, "nai": then translate for Amen, "So be it, come, Lord Jesus"; joining the "Amen," or "So be it," not with Christ's saying (for He calls Himself the "Amen" at the beginning of sentences, rather than puts it as a confirmation at the end), but with John's reply. Christ's "I come," and John's "Come," are almost coincident in time; so truly does the believer reflect the mind of his Lord.