diff --git a/chapter05/flex.xml b/chapter05/flex.xml
index a1d3f9e2f..94c91a1dd 100644
--- a/chapter05/flex.xml
+++ b/chapter05/flex.xml
@@ -25,7 +25,7 @@
 </sect2>
 
 <sect2 role="installation">
-<title>Installation of Bison</title>
+<title>Installation of Flex</title>
 
 <para>Flex contains several known bugs. Fix these with the following patch:</para>