Ability to Edit comments

We would like the ability to edit comments in JIRA. We would like this as we find that sometimes comments have spelling mistakes or small inaccuracies. This may seem trivial but as soon as a comment no longer is spelt correctly it is no longer searchable. Having a couple of dyslexics working in the company - this happens more often that you might imagine.

The only current possibility that we have is to delete comments and add them over. Doing this can spoil their ordering.