diff --git a/book b/book
index 680dba8..cc569dc 160000
--- a/book
+++ b/book
@@ -1 +1 @@
-Subproject commit 680dba813d5bbd006abd7c7174f315a1caa0062a
+Subproject commit cc569dc4c19edfc29abfde9e4ecd9a06025cae61