diff --git a/core-java-modules/core-java-lang-oop-patterns/README.md b/core-java-modules/core-java-lang-oop-patterns/README.md
index 4e171483e6..7ea979435e 100644
--- a/core-java-modules/core-java-lang-oop-patterns/README.md
+++ b/core-java-modules/core-java-lang-oop-patterns/README.md
@@ -11,3 +11,4 @@ This module contains articles about Object-oriented programming (OOP) patterns i
 - [Should We Create an Interface for Only One Implementation?](https://www.baeldung.com/java-interface-single-implementation)
 - [How to Deep Copy an ArrayList in Java](https://www.baeldung.com/java-arraylist-deep-copy)
 - [Stateless Object in Java](https://www.baeldung.com/java-stateless-object)
+- [Mutable vs. Immutable Objects in Java](https://www.baeldung.com/java-mutable-vs-immutable-objects)