diff --git a/book b/book
index 75df8b8..b3c3f8d 160000
--- a/book
+++ b/book
@@ -1 +1 @@
-Subproject commit 75df8b8750b87414513bfb6e7bbec041b3b80e88
+Subproject commit b3c3f8ddd5aee92584d9b76b9dbab09dd8c9b55f