[Haskell] A haddock question

[Benjamin Franksen]

Hello,

I have a module with a public class plus some instances for public data 
types. In addition, I use this class inside another module where I 
declare local (module private) data types and make them instances of 
the class. I had expected that haddock (I am using 0.7) will list in 
the documentation only instances of data types that are exported, but 
instead all instances are listed.

Is there a way to persuade haddock to list only instances of data types 
that are actually visible to the user?

Ben