diff --git a/VL2.tex b/VL2.tex
index 407579a..669a7e0 100644
--- a/VL2.tex
+++ b/VL2.tex
@@ -712,6 +712,7 @@ GHCi...
 \begin{itemize}
 \item what is the difference between \code{let} and \code{where}?
 \item what is the difference between \code{foldr} and \code{foldl}?
+\item what is the difference between explicit and implicit recursion? Give examples
 \item how many arguments does a haskell function have (strictly speaking)?
 \item what do you have to keep in mind in order to make function composition work?
 \item can you define map and filter in terms of foldr?