diff --git a/links.md b/links.md
index 883dbdb..e1e0d02 100644
--- a/links.md
+++ b/links.md
@@ -20,3 +20,4 @@ A website for competitive programming challange
 How to copy files to linux
 8. [How to compress the whole directory using xz and tar in Linux](https://www.cyberciti.biz/faq/compress-the-whole-directory-using-xz-and-tar/)<br>
 How to compress to tar and xz
+9. [Slides of Silberzast](https://codex.cs.yale.edu/avi/os-book/OS10/slide-dir/)Slides of Silberzast