diff --git a/core-java-modules/core-java-collections-5/README.md b/core-java-modules/core-java-collections-5/README.md
index acee8154f7..c9fce58ac2 100644
--- a/core-java-modules/core-java-collections-5/README.md
+++ b/core-java-modules/core-java-collections-5/README.md
@@ -10,4 +10,5 @@
 - [Remove Elements From a Queue Using Loop](https://www.baeldung.com/java-remove-elements-queue)
 - [Intro to Vector Class in Java](https://www.baeldung.com/java-vector-guide)
 - [HashSet toArray() Method in Java](https://www.baeldung.com/java-hashset-toarray)
+- [Time Complexity of Java Collections Sort in Java](https://www.baeldung.com/java-time-complexity-collections-sort)
 - More articles: [[<-- prev]](/core-java-modules/core-java-collections-4)