diff --git a/book.json b/book.json
index 8afdde8..2cae50e 100644
--- a/book.json
+++ b/book.json
@@ -8,6 +8,7 @@
 	},
 	"plugins": [
 		"katex",
-		"-search"
+		"-search",
+		"-lunr"
 	]
 }