diff --git a/core-java-modules/core-java-collections-4/README.md b/core-java-modules/core-java-collections-4/README.md
index 8cd52addfd..f3a7d87403 100644
--- a/core-java-modules/core-java-collections-4/README.md
+++ b/core-java-modules/core-java-collections-4/README.md
@@ -15,3 +15,4 @@
 - [Guide to Java PriorityQueue](https://www.baeldung.com/java-priorityqueue)
 - [Java Generics PECS – Producer Extends Consumer Super](https://www.baeldung.com/java-generics-pecs)
 - [Reversing a Stack in Java](https://www.baeldung.com/java-reversing-a-stack)
+- [Sorting a HashSet in Java](https://www.baeldung.com/java-sort-hashset)