diff --git a/source/cpic/index.rst b/source/cpic/index.rst
index c7767ad54b7b88a152340b690bfb5933f4673e8e..e830877f26499391d2b5fd31dc4b5c71e982c6fa 100644
--- a/source/cpic/index.rst
+++ b/source/cpic/index.rst
@@ -20,7 +20,7 @@ CPISM: CSST/CPI-C 观测图像仿真软件包
 
    程序安装 <installation>
    使用说明 <tutorials>
-   代码说明 <cpism.html>
+   代码说明 <cpism>