Document VarSet

diff --git a/compiler/basicTypes/VarSet.lhs b/compiler/basicTypes/VarSet.lhs
index d7e8567..f73bf1f 100644 (file)
--- a/compiler/basicTypes/VarSet.lhs
+++ b/compiler/basicTypes/VarSet.lhs
@@ -5,7 +5,10 @@
 
 \begin{code}
 module VarSet (
+        -- * Var, Id and TyVar set types
        VarSet, IdSet, TyVarSet,
+       
+       -- ** Manipulating these sets
        emptyVarSet, unitVarSet, mkVarSet,
        extendVarSet, extendVarSetList, extendVarSet_C,
        elemVarSet, varSetElems, subVarSet,