diff --git a/Doc/tut/tut.tex b/Doc/tut/tut.tex
index e45b6e7..be84fcc 100644
--- a/Doc/tut/tut.tex
+++ b/Doc/tut/tut.tex
@@ -2385,7 +2385,8 @@
                 def add(self, x):
                         self.data.append(x)
                 def addtwice(self, x):
-                self.add(x) self.add(x)
+                        self.add(x)
+                        self.add(x)
 \end{verbatim}