From 49149211bbeb1ae5a8a9ca453c645d7691ef498c Mon Sep 17 00:00:00 2001
From: johnA1331 <53036378+johnA1331@users.noreply.github.com>
Date: Wed, 10 Nov 2021 19:41:57 +0800
Subject: [PATCH] Update README.md

---
 core-java-modules/core-java-collections-maps-4/README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/core-java-modules/core-java-collections-maps-4/README.md b/core-java-modules/core-java-collections-maps-4/README.md
index 54ab60da7d..cb25aa5a8a 100644
--- a/core-java-modules/core-java-collections-maps-4/README.md
+++ b/core-java-modules/core-java-collections-maps-4/README.md
@@ -4,3 +4,4 @@ This module contains articles about Map data structures in Java.
 
 ### Relevant Articles: 
 - [Using a Custom Class as a Key in a Java HashMap](https://www.baeldung.com/java-custom-class-map-key)
+- [Nested HashMaps Examples in Java](https://www.baeldung.com/java-nested-hashmaps)