Why can't I comment on other questions/answers? [duplicate]

Question

I looking for a diary program, that I can use for writing things, shopping, doctor apointments, and other things for my wife and I found an answer.

But I can't ask the guy a question like other answer where you can comment. This one has no comment available. why?

How can I can leave a comment?

Here is the question and answer.

What Digital Diaries are available?

Can you help me.

Answer 1

You need a minimum of 50 rep to be able to comment "everywhere".

Please see this section of the FAQ..

^{If you really, desperately, absolutely need to comment without the minimal rep -- post the comment as answer, and it will most probably be flagged and converted into a comment in a little bit.}