diff --git a/src/Renderer.hs b/src/Renderer.hs
index eedeb1eee..fb6668f2e 100644
--- a/src/Renderer.hs
+++ b/src/Renderer.hs
@@ -1,6 +1,8 @@
 {-# LANGUAGE GADTs #-}
 module Renderer
-( Renderer
+( DiffRenderer(..)
+, runDiffRenderer
+, Renderer
 , Output(..)
 , concatOutputs
 , Format(..)