From 1e72400a7c73c4251b69388cc85bfc765e661c34 Mon Sep 17 00:00:00 2001
From: collaboratewithakash
 <38683470+collaboratewithakash@users.noreply.github.com>
Date: Tue, 5 Feb 2019 15:14:51 +0530
Subject: [PATCH] Back-link added

---
 core-java-9/README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/core-java-9/README.md b/core-java-9/README.md
index c96267dc95..d9586ba684 100644
--- a/core-java-9/README.md
+++ b/core-java-9/README.md
@@ -26,3 +26,4 @@
 - [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
 - [Java 9 Platform Logging API](https://www.baeldung.com/java-9-logging-api)
 - [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)
+- [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)