[Note: It's not necesary to make a second comment. You can edit your post for 1 or 2 hours. (I never remember.) If you change the comment too much, add a note,

[Note: It's not necesary to make a second comment. You can edit your post for 1 or 2 hours. (I never remember.) If you change the comment too much, add a note, specialy if someone replied to your comment.] Edit: Just like this. For obvious typos I usualy don't add the note anyway.