A follow-on to jscott, but some threads from MSO that discuss this point:
- 50 reputation for making comments is too high50 reputation for making comments is too high
- Lower the amount of reputation needed to commentLower the amount of reputation needed to comment
- Is the ability of low-rep users to comment within their own questions adequately documented?Is the ability of low-rep users to comment within their own questions adequately documented?
As your your question about comment-formatting, that isn't well documented, but you can format comments: