diff --git a/book-monads b/book-monads
index 3ff695d..f6e04d7 160000
--- a/book-monads
+++ b/book-monads
@@ -1 +1 @@
-Subproject commit 3ff695d815a2d8a20d9eb238800be414d2881ab0
+Subproject commit f6e04d75bab4a8dec916cc98a6dc18d26616888e