diff --git a/doc/book.toml b/doc/book.toml
index 2138e6fd2..474bddb1f 100644
--- a/doc/book.toml
+++ b/doc/book.toml
@@ -1,5 +1,4 @@
 [book]
 authors = ["Lukas Diekmann", "Laurence Tratt"]
-multilingual = false
 src = "src"
 title = "grmtools"