diff --git a/chapter04.tex b/chapter04.tex
index a63a310..bec5ceb 100644
--- a/chapter04.tex
+++ b/chapter04.tex
@@ -393,7 +393,7 @@ cout << *it << "\n";
 \end{lstlisting}
 
 Iterators can be moved using the operators
-\texttt{++} (forward) and \texttt{---} (backward),
+\texttt{++} (forward) and \texttt{--} (backward),
 meaning that the iterator moves to the next
 or previous element in the set.