diff --git a/programming/exercises/control_flow.tex b/programming/exercises/control_flow.tex
index 99984f2..f7e3ad7 100644
--- a/programming/exercises/control_flow.tex
+++ b/programming/exercises/control_flow.tex
@@ -1,4 +1,4 @@
-\documentclass[12pt,a4paper,pdftex]{exam}
+\documentclass[12pt,a4paper,pdftex, answers]{exam}
 
 \usepackage[german]{babel}
 \usepackage{natbib}