diff --git a/extras/courses.md b/extras/courses.md
index 650a765..c403bd0 100644
--- a/extras/courses.md
+++ b/extras/courses.md
@@ -70,6 +70,7 @@ Courses | Duration | Effort
 [Programming Challenges (Skiena)](http://www3.cs.stonybrook.edu/~skiena/392/) | 14 weeks | 6-8 hours/week
 [Mathematical Logic and Algorithms Theory](https://iversity.org/en/courses/mathematical-logic-and-algorithms-theory) | 7 weeks | 3-4 hours/week
 [Algorithmic Toolbox](https://www.coursera.org/learn/algorithmic-toolbox/) | 5 weeks | 4-8 hours/week
+[Algorithms on Graphs and Trees](https://www.coursera.org/learn/algorithms-on-graphs-and-trees/) | - | -
 [Analysis of Algorithms](https://www.coursera.org/course/aofa) | 6 weeks | 6-8 hours/week
 
 ### Programming Paradigms