diff --git a/book b/book
index 82bf815..30679ff 160000
--- a/book
+++ b/book
@@ -1 +1 @@
-Subproject commit 82bf815f1e6c19e99e0d16662e060e442e1f35fb
+Subproject commit 30679ff7b9c848e9280b9ab91c9c3f2c34b5dc03