diff --git a/book.toml b/book.toml
index 12d7f2d..3b9228e 100644
--- a/book.toml
+++ b/book.toml
@@ -6,6 +6,12 @@ src = "src"
 title = "CCNA60D Chinese, 中文版 CCNA 60 days"
 description = "CCNA in 60 days Chinese, 中文版 CCNA 60 days"
 
+
+[preprocessor.last-changed]
+command = "mdbook-last-changed"
+renderer = ["html"]
+
+
 [preprocessor.pagetoc]
 [output.html]
 additional-css = ["theme/pagetoc.css"]