diff --git a/book b/book
index 29e1cee..f022f23 160000
--- a/book
+++ b/book
@@ -1 +1 @@
-Subproject commit 29e1cee5b31d276da5e75767a77eeaf93e27a77d
+Subproject commit f022f23194a11f8b68a5382e88c5191524fabe5d