How does one get an answer undeleted? My answer was deleted, and I have modified it to respond to the comment. What else need be done to undelete it?
Bringing it up here on meta is a good start. Flagging the post for moderator attention is another option.
Normally, it would take three votes from users with the delete privelege to undelete a deleted answer, but since one of the users who voted to delete in this case was a moderator, it will take a moderator to undelete.
Since you've expanded the answer, I've gone ahead and undeleted it.