diff --git a/eBook/12.2.md b/eBook/12.2.md
index f7dc655..a6b3a24 100644
--- a/eBook/12.2.md
+++ b/eBook/12.2.md
@@ -141,7 +141,7 @@ import "path/filepath"
 filename := filepath.Base(path)
 ```
 
-**练习 12.3**：read_csv.go
+**练习 12.3**：[read_csv.go](exercises/chapter_12/read_csv.go)
 
 文件 products.txt 的内容如下：
 ```