Refer people to QC's GenT type as a default implementation for MonadGen

README.md

@@ -5,6 +5,8 @@
 
 A type class for random generator implementations.
 
+Note that this library only provides the `MonadGen` type class; it does not provide any implementations of it. The intention is that libraries may depend on `purescript-gen` in order to provide functions for random generation of any data types they define while also keeping their dependency footprints minimal, and not tying users to any specific random generation library (since any library implementing random generation of values should be able to implement the `MonadGen` interface).
+
 ## Installation
 
 ```

src/Control/Monad/Gen/Class.purs

@@ -6,6 +6,9 @@ import Prelude
 -- |
 -- | Instances should provide implementations for the generation functions
 -- | that return choices with uniform probability.
+-- |
+-- | See also `Gen` in `purescript-quickcheck`, which implements this
+-- | type class.
 class Monad m <= MonadGen m where
 
   -- | Chooses an integer in the specified (inclusive) range.