diff --git a/src/data/roadmaps/cyber-security/content/101-operating-systems/learn-for-each/106-understand-permissions.md b/src/data/roadmaps/cyber-security/content/101-operating-systems/learn-for-each/106-understand-permissions.md
index 6c20ab0fa..aea356103 100644
--- a/src/data/roadmaps/cyber-security/content/101-operating-systems/learn-for-each/106-understand-permissions.md
+++ b/src/data/roadmaps/cyber-security/content/101-operating-systems/learn-for-each/106-understand-permissions.md
@@ -32,3 +32,5 @@ To ensure cyber security with permissions, follow these best practices:
 - **Implement Security Training**: Educate users about the importance of permissions and their responsibilities to maintain a secure environment.
 
 By understanding permissions and following best practices, you can enhance cyber security and minimize the risk of unauthorized access and data breaches.
+
+- [Linux File Permissions (Linux Journey)](https://linuxjourney.com/lesson/file-permissions)
\ No newline at end of file