finding the revision that introduced a line of code

[Lucio Crusca]

Hello *,

I've been using bazaar for a short time, about two months doing only 
"standard" things, so I'm quite new to it.

Now I need to find what revision introduced a particular line of code, because 
I forgot to comment that change in the sources and now I have to decide if 
that line is still useful or not, and I'm hoping the commit message will tell 
me...

How do I find the revision, assuming the source file is named MyClass.java and 
the line number is 471?