diff --git a/src/data/roadmaps/flutter/content/106-design-principles/103-oop.md b/src/data/roadmaps/flutter/content/106-design-principles/103-oop.md
index 29fa638dd..7813d7202 100644
--- a/src/data/roadmaps/flutter/content/106-design-principles/103-oop.md
+++ b/src/data/roadmaps/flutter/content/106-design-principles/103-oop.md
@@ -5,4 +5,5 @@ Object-oriented programming (OOP) is a programming paradigm that is based on the
 Learn more from the following links:
 
 - [Discover Object Oriented Programming](https://blog.hubspot.com/website/object-oriented-programming)
-- [Software Development Tutorial - What is object-oriented language?s](https://www.youtube.com/watch?app=desktop&v=SS-9y0H3Si8)
+- [Software Development Tutorial - What is object-oriented languages?](https://www.youtube.com/watch?app=desktop&v=SS-9y0H3Si8)
+- [Fundamental Concepts of Object Oriented Programming](https://www.youtube.com/watch?v=m_MQYyJpIjg&ab_channel=ComputerScience)