diff --git a/docs/操作系统/CS162.en.md b/docs/操作系统/CS162.en.md
index 4f2a92fa..44942714 100644
--- a/docs/操作系统/CS162.en.md
+++ b/docs/操作系统/CS162.en.md
@@ -18,7 +18,7 @@ Unlike the small but comprehensive design philosophy in MIT's xv6 labs, *Pintos*
 
 Although it is tough, Stanford, Berkeley, JHU and many other top U.S. Schools have adopted Pintos for their OS courses. If you're really interested in operating systems, Pintos will greatly improve your ability to write and debug the underlying system code. It is an invaluable experience at the undergraduate level to design, implement, and debug a large system on your own.
 
-*Pintos* willalso be introduced as a course project in Peking University's OS Course. In the Spring 2022 semester, I worked with [Another TA](https://github.com/AlfredThiel) to write a comprehensive [lab documentation](https://alfredthiel.gitbook.io/pintosbook/) and provided a docker image for the ease of cross-platform development. In the last semester before graduation, I hope such an attempt can make more people fall in love with systems and contribute to the field of systems in China.
+*Pintos* will also be introduced as a course project in Peking University's OS Course. In the Spring 2022 semester, I worked with [Another TA](https://github.com/AlfredThiel) to write a comprehensive [lab documentation](https://alfredthiel.gitbook.io/pintosbook/) and provided a docker image for the ease of cross-platform development. In the last semester before graduation, I hope such an attempt can make more people fall in love with systems and contribute to the field of systems in China.
 
 ## Course Resources