diff --git a/chapter03.tex b/chapter03.tex
index 8a25b0a..b5a5f43 100644
--- a/chapter03.tex
+++ b/chapter03.tex
@@ -630,9 +630,9 @@ the function \texttt{sort} that can be easily used for
 sorting arrays and other data structures.
 
 There are many benefits in using a library function.
-Firstly, it saves time because there is no need to
+First, it saves time because there is no need to
 implement the function.
-Secondly, the library implementation is
+Second, the library implementation is
 certainly correct and efficient: it is not probable
 that a self-made sorting function would be better.