diff --git a/book/book.toml b/book/book.toml
index 3bb4385..7a0b67d 100644
--- a/book/book.toml
+++ b/book/book.toml
@@ -1,7 +1,6 @@
 [book]
 authors = ["martinjrobins"]
 language = "en"
-multilingual = false
 src = "src"
 title = "DiffSL"