diff --git a/spago.dhall b/spago.dhall
index 9a2c076..1c86410 100644
--- a/spago.dhall
+++ b/spago.dhall
@@ -3,7 +3,7 @@ Welcome to a Spago project!
 You can edit this file as you like.
 -}
 { name = "typeable"
-, dependencies = [ "console", "effect", "psci-support" ]
+, dependencies = [ "console", "effect", "psci-support", "either", "arrays" ]
 , packages = ./packages.dhall
 , sources = [ "src/**/*.purs", "test/**/*.purs" ]
 }
diff --git a/src/Typeable.purs b/src/Typeable.purs
index 3ed2514..4f93d77 100644
--- a/src/Typeable.purs
+++ b/src/Typeable.purs
@@ -1,9 +1,10 @@
 module Typeable where
 
+import Data.Either (Either)
 import Data.Unit (Unit)
 import Effect (Effect)
 
--- Indexed Typereps
+-- Indexed TypeReps
 data TypeRep a
 
 -- Typeable class
@@ -21,8 +22,8 @@ class Tag3 (a :: Type -> Type -> Type) where t3 :: Proxy3 a
 
 -- Constructors for the opaque data type
 foreign import typerepImpl1 :: forall a. Tag1 a => TypeRep a
-foreign import typerepImpl2 :: forall a b. Typeable b => Tag2 a => TypeRep (a b)
-foreign import typerepImpl3 :: forall a b c. Typeable c => Typeable b => Tag1 c => TypeRep (a b c)
+foreign import typerepImpl2 :: forall a b. Tag2 a => Typeable b => TypeRep (a b)
+foreign import typerepImpl3 :: forall a b c. Tag3 a => Typeable b => Typeable c => TypeRep (a b c)
 
 -- Type equality
 foreign import eqTypeRep :: forall a b. TypeRep a -> TypeRep b -> Boolean
@@ -32,6 +33,8 @@ instance tag1Int :: Tag1 Int where t1 = Proxy1
 instance typeableInt :: Typeable Int where typeRep = typerepImpl1
 instance tag2Array :: Tag2 Array where t2 = Proxy2
 instance typeableArray :: Typeable a => Typeable (Array a) where typeRep = typerepImpl2
+instance tag3Either :: Tag3 Either where t3 = Proxy3
+instance typeableEither :: (Typeable a, Typeable b) => Typeable (Either a b) where typeRep = typerepImpl3
 
 -- DEBUG: Console.log anything
 foreign import clog :: forall a. a -> Effect Unit
diff --git a/test/Main.purs b/test/Main.purs
index 5fc8ebd..deb122f 100644
--- a/test/Main.purs
+++ b/test/Main.purs
@@ -2,6 +2,7 @@ module Test.Main where
 
 import Prelude
 
+import Data.Either (Either)
 import Effect (Effect)
 import Typeable (class Tag1, class Tag2, class Typeable, Proxy1(..), Proxy2(..), TypeRep, clog, eqTypeRep, typeRep, typerepImpl1, typerepImpl2)
 
@@ -11,6 +12,8 @@ main = do
   clog (eqTypeRep (typeRep :: _ (Array Person2)) typeArrPerson)
   clog (eqTypeRep (typeRep :: _ (Optional Int)) (typeRepFromVal (Some 1)))
   clog (eqTypeRep (typeRep :: _ (Optional Person)) (typeRepFromVal (Some 1)))
+  clog (eqTypeRep (typeRep :: _ (Either Int Person)) (typeRep :: _ (Either Int Person)))
+  clog (typeRep :: _ (Either (Either Int Int) (Optional (Array (Person)))))
   where
     typeArrPerson :: TypeRep (Array Person)
     typeArrPerson = typeRep