diff --git a/doc/fluid/index_en.rst b/doc/fluid/index_en.rst
index 5ca97ac027415d38020da02cadeac0bdb589a454..433804882babfa448e0dc644e66f397be789993b 100644
--- a/doc/fluid/index_en.rst
+++ b/doc/fluid/index_en.rst
@@ -9,6 +9,5 @@
   howto/index_en.rst
   dev/index_en.rst
   api/index_en.rst
-  book/index_en.rst
   user_guides/models/index_en.rst
   advanced_usage/deploy/index_mobile.rst