diff --git a/book.asciidoc b/book.asciidoc
index f3973f18..5f71ab85 100644
--- a/book.asciidoc
+++ b/book.asciidoc
@@ -18,4 +18,6 @@ include::ch06.asciidoc[]
 
 include::ch07.asciidoc[]
 
-include::ch08.asciidoc[]
\ No newline at end of file
+include::ch08.asciidoc[]
+
+include::ch09.asciidoc[]
\ No newline at end of file