diff --git a/chapter04.tex b/chapter04.tex
index c0443f4..dfd25c0 100644
--- a/chapter04.tex
+++ b/chapter04.tex
@@ -740,5 +740,5 @@ sorting is a simple procedure and it is done
 only once at the beginning of algorithm 3,
 and the rest of the algorithm works in linear time.
 On the other hand,
-algorithm 3 maintains a complex balanced binary tree
-during the whole algorithm.
\ No newline at end of file
+algorithm 1 maintains a complex balanced binary tree
+during the whole algorithm.