diff --git a/book.toml b/book.toml
index 2c1d73ab..43f0f48a 100644
--- a/book.toml
+++ b/book.toml
@@ -3,11 +3,13 @@
 title = "Rust Cookbook"
 description = "Collection of useful Rust code examples"
 authors = ["Rust Language Community"]
-edition = "2018"
 multilingual = false
 language = "en"
 src = "src"
 
+[rust]
+edition = "2018"
+
 [output.html]
 mathjax-support = false
 # theme = "theme"