Hi - maybe i'm just sleepy and missed an obvious button!

Some threads/discussions are v interesting and, even though I don't know enough to make a contribution, would like to get an email when a new contribution is made (like the one I get when someone replies after me on a thread).

Is this doable? I suppose one could just post a small reply indicating am doing so in order to follow it - but am not sure if that would be appreciated!

Pls advise - thanks,
AMB