diff --git a/merkzettel.pdf b/merkzettel.pdf
index 3a9d78d..5494a4b 100644
Binary files a/merkzettel.pdf and b/merkzettel.pdf differ
diff --git a/merkzettel.tex b/merkzettel.tex
index d0442c1..1a209b0 100644
--- a/merkzettel.tex
+++ b/merkzettel.tex
@@ -429,4 +429,8 @@ x\ \text{, falls $minimum\ xs$ = 0}\\
 min\ x\ (minimum\ xs)\ \text{, sonst}
 \end{cases*}
 \end{align*}
+\begin{align*}
+Nil \oplus ys &= ys\\
+(Cons\ x\ xs) \oplus ys\ &= Cons\ x\ (xs \oplus ys)
+\end{align*}
 \end{document}
\ No newline at end of file