diff --git a/core-java-modules/core-java-16/README.md b/core-java-modules/core-java-16/README.md
index 4e428c7fc1..b2740d194c 100644
--- a/core-java-modules/core-java-16/README.md
+++ b/core-java-modules/core-java-16/README.md
@@ -4,3 +4,4 @@
 - [Guide to mapMulti in Stream API](https://www.baeldung.com/java-mapmulti)
 - [Collecting Stream Elements into a List in Java](https://www.baeldung.com/java-stream-to-list-collecting)
 - [New Features in Java 16](https://www.baeldung.com/java-16-new-features)
+- [Guide to Java 8 groupingBy Collector](https://www.baeldung.com/java-groupingby-collector)