Can git log <file> follow log of its origins?

Hi all,

If I do the following:

     $ git init
     $ echo "The brown fox is getting old" > a.txt
     $ git add a.txt
     $ git commit -m "Commit a.txt"

     $ cp a.txt b.txt
     $ git add b.txt
     $ git commit -m "Copy a.txt to b.txt"

     $ git log b.txt

I only see the log corresponding to the 2nd commit (v1.5.3.5). Is it possible to have the above command keep going and show the history of a.txt? Or at least somehow indicate that b.txt originated from a.txt?

Thanks, MP

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