diff --git a/book b/book
index 9a8acb3..e0cc8ee 160000
--- a/book
+++ b/book
@@ -1 +1 @@
-Subproject commit 9a8acb33b61a4ec8904aecfd1c4376b1525a8030
+Subproject commit e0cc8ee0cf6e73cd5def6938cfaaa81db92fa721