diff --git a/courses/free-courses-en.md b/courses/free-courses-en.md
index b70336eba..d2618afd4 100644
--- a/courses/free-courses-en.md
+++ b/courses/free-courses-en.md
@@ -163,6 +163,7 @@
 * [Dynamic Programming](https://www.youtube.com/playlist?list=PLMCXHnjXnTnto1pZVvH7rbZ9W5neZ7Yhc) - Gaurav Sen
 * [Dynamic Programming](https://www.youtube.com/playlist?list=PLDV1Zeh2NRsAsbafOroUBnNV8fhZa7P4u) - WilliamFiset
 * [Graph Series by Striver \| C++ \| Java \| Interview Centric \| Algorithms \| Problems](https://www.youtube.com/playlist?list=PLgUwDviBIf0oE3gA41TKO2H5bHpPd7fzn) - take U forward
+* [Graph Theory playlist](https://youtube.com/playlist?list=PLDV1Zeh2NRsDGO4--qE8yH72HFL1Km93P) - WilliamFiset
 * [IIT Bombay Foundation of Data Structures (CS213.1x)](https://courses.edx.org/courses/course-v1:IITBombayX+CS213.1x+1T2017/course/)
 * [Intro to Data Structures and Algorithms](https://www.udacity.com/course/data-structures-and-algorithms-in-python--ud513) - Brynn Claypoole, Horatio Thomas (Udacity)
 * [JavaScript Algorithms and Data Structures](https://www.youtube.com/playlist?list=PLC3y8-rFHvwjPxNAKvZpdnsr41E0fCMMP) - Codevolution