[Orgmode] Comments in tangled source

[aditya siram]

Hi all,
I have a heading like this : 
* Root
Comments about root.
#+begin_src haskell :noweb yes :comments yes :tangle Main.hs
  main = print "hello world"
#+end_src

When I tangle the file, I would expect the "Comments about root" to be a comment above the source like so:

-- Comments about root
main = print "hello world" 

but I don't get this. What am I doing wrong?

thanks ...
-deech