Right now when i see a question that needs more details, i ask the OP about adding some more details to the question, and he will probably add some extra details and then respond to me using @ in the comments.
But when a question actually needs more information, but someone already asked for that (such as this one) , i can't leave another comment with the exact note. It is annoying for the OP, and there is a chance he will not reply to the next comment.
So i have to either bookmark/favorite the question or remember the title to check it later to see if the required information have been added to it or not (since i can't answer the question without further information).
What i'm thinking is, there should actually be a subscribe button for each question so we can receive notifications about that.
There is actually an RSS feed available right now, but not very satisfying. A user friendly feature like this in WPSE would be nicer. What do you think?
PS : I couldn't find another topic about this, and haven't notice any feature like this in my 11 months membership. so excuse me if this is a repetitive question on meta.