diff --git a/courses/free-courses-en.md b/courses/free-courses-en.md
index 2bc581b34..0c6d7f15b 100644
--- a/courses/free-courses-en.md
+++ b/courses/free-courses-en.md
@@ -1818,6 +1818,7 @@
 ### System Design
 
 * [Basics of System Design](https://www.youtube.com/playlist?list=PLt4nG7RVVk1g_LutiJ8_LvE914rIE5z4u) - Coding Simplified
+* [Low Level Design + MultiThreading Course](https://www.youtube.com/playlist?list=PLpxM6m39X_t-Rk9lZVVD4U6JycAAIIEDW) - codeWithAryan 
 * [System Design](https://www.youtube.com/playlist?list=PLsdq-3Z1EPT27BuTnJ_trF7BsaTpYLqst) - Arpit Bhayani
 * [System Design](https://www.youtube.com/playlist?list=PLMCXHnjXnTnvo6alSjVkgxV-VH6EPyvoX) - Gaurav Sen
 * [System Design](https://www.youtube.com/playlist?list=PLliXPok7ZonnZd99TE0Zzn1MZlE4u08GW) - Keerti Purswani