diff --git a/book/book.toml b/book/book.toml
index dc78c61..5643090 100644
--- a/book/book.toml
+++ b/book/book.toml
@@ -9,4 +9,4 @@ title = "Nihil Unbound"
 [output.html]
 default-theme = "rust"
 no-section-label = true
-additional-css = ["css/custom.css"]
\ No newline at end of file
+additional-css = ["src/css/custom.css"]
\ No newline at end of file