diff --git a/C Crash Course/21 Input&Output/prelesson/binary file/fwrite/student information/readme.md b/C Crash Course/21 Input&Output/prelesson/binary file/fwrite/student information/readme.md
index a190efd..fc18914 100644
--- a/C Crash Course/21 Input&Output/prelesson/binary file/fwrite/student information/readme.md	
+++ b/C Crash Course/21 Input&Output/prelesson/binary file/fwrite/student information/readme.md	
@@ -1,4 +1,4 @@
-程序中向文件中写入2进制文本
+程序中向文件中写入/读取2进制文本
 
 linux 下可以用 `od` 命令打开文件