Is an second election required for a follow-up payment that should have been part of the original distribution?

[Guest Livia]

A DB plan participant retired and elected a direct rollover of his accrued benefit. Two months later the plan realized that the lump sum paid was too small because it did not account for certain service. The plan is now ready to make a second payment to the participant. We want to rely upon the original distribution election for this second payment. Any reason not to do that? Should the participant be able to elect again?