diff --git a/book.asciidoc b/book.asciidoc
index ad79eeaa..586bb363 100644
--- a/book.asciidoc
+++ b/book.asciidoc
@@ -6,4 +6,6 @@ include::preface.asciidoc[]
 
 include::ch01.asciidoc[]
 
-include::ch02.asciidoc[]
\ No newline at end of file
+include::ch02.asciidoc[]
+
+include::ch03.asciidoc[]
\ No newline at end of file