diff --git a/src/doc/book b/src/doc/book
index 4ee596df22f..6f1a03dae6b 160000
--- a/src/doc/book
+++ b/src/doc/book
@@ -1 +1 @@
-Subproject commit 4ee596df22f8ecaa9a0b2ddc0624b0104540dbf7
+Subproject commit 6f1a03dae6bcea44976918186f2d554186b3499c