diff --git a/src/Language/Json/Type.hs b/src/Language/Json/Type.hs
index 2df689a..023c325 100644
--- a/src/Language/Json/Type.hs
+++ b/src/Language/Json/Type.hs
@@ -85,6 +85,8 @@ isObject = \case
   Object _ -> True
   _ -> False
 
+-- | Find the type of a value.
+
 infer :: Json.Value -> Type
 infer = \case
   Value.Null -> Null
@@ -107,6 +109,8 @@ instance HasField "actual" Mismatch Type where
   getField :: Mismatch -> Type
   getField = (.inferred)
 
+-- | Compute all the differences to the expected type. Empty List means that the value is conforming.
+
 conforms :: Type -> Json.Value -> [Mismatch]
 conforms = conforms' []
 
@@ -135,6 +139,8 @@ conforms' path layout value = case (value, layout) of
       else Foldable.concatMap id mismatches
   _ -> pure $ Mismatch {expected=layout, inferred=infer value, value=value, path=path}
 
+-- | Choose any arbitrary value conforming to the type.
+
 sample :: Type -> Gen Value
 sample = \case
   All                   -> arbitrary