diff --git a/core-java-modules/core-java-collections-5/README.md b/core-java-modules/core-java-collections-5/README.md
index 0d9b12b842..1769d11686 100644
--- a/core-java-modules/core-java-collections-5/README.md
+++ b/core-java-modules/core-java-collections-5/README.md
@@ -4,4 +4,5 @@
 
 ### Relevant Articles:
 - [Introduction to Roaring Bitmap](https://www.baeldung.com/java-roaring-bitmap-intro)
+- [Creating Custom Iterator in Java](https://www.baeldung.com/java-creating-custom-iterator)
 - More articles: [[<-- prev]](/core-java-modules/core-java-collections-4)