diff --git a/book.toml b/book.toml
index 252e5085..fd02bf41 100644
--- a/book.toml
+++ b/book.toml
@@ -8,6 +8,9 @@ title = "Comprehensive Rust 🦀"
 [rust]
 edition = "2021"
 
+[build]
+extra-watch-dirs = ["po"]
+
 [preprocessor.links]
 renderers = ["html"]