"See so-and-so's comment" doesn't meet the standard for an answer on our site. Answers should be complete in themselves; for example, if BruceET was to delete his comment, your answer would be useless.

It is usually seen as acceptable to

• invite the author of the comment to post as an answer, if you feel it is a complete answer to the question, or

• to simply post the information in the comment as an answer yourself, expanding on it where necessary to make it a suitable answer (comments are usually overly brief for answers), as long as you credit the source (and as long as the answer doesn't duplicate other answers on site)

You already tried the first. That was well done. The next step would be to try the second thing.

Edit: I don't see it as absolutely necessary to mark the answer as community wiki (per gung's answer) - some people do it to signal that they're not trying to gain reputation from someone else's information, but I think there's no real problem with that if you follow the ordinary standards of decent behavior (which I feel you already covered more than sufficiently by inviting the commenter to post an answer); if you happen to subsequently get an upvote or two by turning your question into a properly answered one, good luck to you.

"See so-and-so's comment" doesn't meet the standard for an answer on our site. Answers should be complete in themselves; for example, if BruceET was to delete his comment, your answer would be useless.

It is usually seen as acceptable to

• invite the author of the comment to post as an answer, if you feel it is a complete answer to the question, or

• to simply post the information in the comment as an answer yourself, expanding on it where necessary to make it a suitable answer (comments are usually overly brief for answers), as long as you credit the source (and as long as the answer doesn't duplicate other answers on site)

You already tried the first. That was well done. The next step would be to try the second thing.

Edit: I don't see it as absolutely necessary to mark the answer as community wiki (per gung's answer) - some people do it to signal that they're not trying to gain reputation from someone else's information, which is a fine and admirable choice but I think there's no real problem with getting the reputation if you follow the ordinary standards of decent behavior (which I feel you already covered more than sufficiently by inviting the commenter to post an answer); if you happen to subsequently get an upvote or two by turning your question into a properly answered one, good luck to you.

"See so-and-so's comment" doesn't meet the standard for an answer on our site. Answers should be complete in themselves; for example, if BruceET was to delete his comment, your answer would be useless.

It is usually seen as acceptable to

• invite the author of the comment to post as an answer, if you feel it is a complete answer to the question, or

• to simply post the information in the comment as an answer yourself, expanding on it where necessary to make it a suitable answer (comments are usually overly brief for answers), as long as you credit the source (and as long as the answer doesn't duplicate other answers on site)

"See so-and-so's comment" doesn't meet the standard for an answer on our site. Answers should be complete in themselves; for example, if BruceET was to delete his comment, your answer would be useless.

It is usually seen as acceptable to

• invite the author of the comment to post as an answer, if you feel it is a complete answer to the question, or

• to simply post the information in the comment as an answer yourself, expanding on it where necessary to make it a suitable answer (comments are usually overly brief for answers), as long as you credit the source (and as long as the answer doesn't duplicate other answers on site)

You already tried the first. That was well done. The next step would be to try the second thing.

Edit: I don't see it as absolutely necessary to mark the answer as community wiki (per gung's answer) - some people do it to signal that they're not trying to gain reputation from someone else's information, but I think there's no real problem with that if you follow the ordinary standards of decent behavior (which I feel you already covered more than sufficiently by inviting the commenter to post an answer); if you happen to subsequently get an upvote or two by turning your question into a properly answered one, good luck to you.