I've seen the following in the Article about bounties under "How is a bounty awarded?":
The bounty period lasts 7 days. Bounties must have a minimum duration of at least 1 day. After the bounty ends, there is a grace period of 24 hours to manually award the bounty. Simply click the bounty award icon next to each answer to permanently award your bounty to the answerer. (You cannot award a bounty to your own answer.)
However, what if my question was resolved by a comment and not by an answer? Is it possible to award the bounty to the comment owner?
Should I ask the comment owner to add it as an answer and then award them the bounty?