From b682fddd885a971fd51ee5384d7c6a24b77b59e9 Mon Sep 17 00:00:00 2001
From: johnA1331 <53036378+johnA1331@users.noreply.github.com>
Date: Wed, 23 Dec 2020 22:38:23 +0800
Subject: [PATCH] Update README.md

---
 core-java-modules/core-java-collections-maps-3/README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/core-java-modules/core-java-collections-maps-3/README.md b/core-java-modules/core-java-collections-maps-3/README.md
index 7386f7e9b7..918c81fe4b 100644
--- a/core-java-modules/core-java-collections-maps-3/README.md
+++ b/core-java-modules/core-java-collections-maps-3/README.md
@@ -6,4 +6,5 @@ This module contains articles about Map data structures in Java.
 - [Java TreeMap vs HashMap](https://www.baeldung.com/java-treemap-vs-hashmap)
 - [Comparing Two HashMaps in Java](https://www.baeldung.com/java-compare-hashmaps)
 - [The Map.computeIfAbsent() Method](https://www.baeldung.com/java-map-computeifabsent)
+- [Collections.synchronizedMap vs. ConcurrentHashMap](https://www.baeldung.com/java-synchronizedmap-vs-concurrenthashmap)
 - More articles: [[<-- prev]](/core-java-modules/core-java-collections-maps-2)