It's easy to find modification between a revision and last one. You can say "oh, I changed this to do this thing, at these lines".
But sometimes, it could be useful to say "oh, I don't remember why I put this line in my code and comment is not enough" and so I would like to ask svn tool (like tortoise, as it is the forum title), find revision where I modified this line of code.
Is it possible yet?
If yes, how?
If not, it is a possible evolution? How to notice the good community?