Possible Duplicate:
Why is the time limit for editing comments only 5 minutes?
I was adding a comment to a question and had a typo that I didn't notice until it was entered. Comments can be flagged, voted but not edited. Why?
Possible Duplicate:
Why is the time limit for editing comments only 5 minutes?
I was adding a comment to a question and had a typo that I didn't notice until it was entered. Comments can be flagged, voted but not edited. Why?
You can edit your own comments for up to 5 minutes after adding.
After that, you can always delete them and create a new comment. Comments are not the focus of Stack Exchange sites, the juicy bits here should be in the questions and answers.
If you are not satisfied with your comment, it is possible for you to delete your own comment, and post a new one with the typo corrected.