diff --git a/VL2.tex b/VL2.tex
index 12f8b69..c828c62 100644
--- a/VL2.tex
+++ b/VL2.tex
@@ -141,6 +141,7 @@ We use \code{where} to define a helper function:
 f :: Int -> Int
 f x = x + (y 2)
   where
+    y :: Int -> Int
     y p = x + p
 \end{haskellcode}
 \end{frame}