diff --git a/core-java-modules/core-java-collections-5/README.md b/core-java-modules/core-java-collections-5/README.md
index 2fc7f7c699..e1ad221a31 100644
--- a/core-java-modules/core-java-collections-5/README.md
+++ b/core-java-modules/core-java-collections-5/README.md
@@ -13,4 +13,5 @@
 - [Check if List Contains at Least One Enum](https://www.baeldung.com/java-list-check-enum-presence)
 - [Comparison of for Loops and Iterators](https://www.baeldung.com/java-for-loops-vs-iterators)
 - [PriorityQueue iterator() Method in Java](https://www.baeldung.com/java-priorityqueue-iterator)
+- [Immutable vs Unmodifiable Collection in Java](https://www.baeldung.com/java-collection-immutable-unmodifiable-differences)
 - More articles: [[<-- prev]](/core-java-modules/core-java-collections-4)