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)