A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
2g
Highly Voted 3 years, 8 months agoAlbertBueno
Most Recent 3 years, 1 month agoBing1113
3 years, 2 months ago