diff --git a/core-java-modules/core-java-concurrency-collections-2/README.md b/core-java-modules/core-java-concurrency-collections-2/README.md
index 2d65cf88e7..fdb7af5936 100644
--- a/core-java-modules/core-java-concurrency-collections-2/README.md
+++ b/core-java-modules/core-java-concurrency-collections-2/README.md
@@ -5,4 +5,5 @@
 - [Java Concurrent HashSet Equivalent to ConcurrentHashMap](https://www.baeldung.com/java-concurrent-hashset-concurrenthashmap)
 - [Reading and Writing With a ConcurrentHashMap](https://www.baeldung.com/concurrenthashmap-reading-and-writing)
 - [ArrayBlockingQueue vs. LinkedBlockingQueue](https://www.baeldung.com/java-arrayblockingqueue-vs-linkedblockingqueue)
+- [Difference Between Hashtable and ConcurrentHashMap in Java](https://www.baeldung.com/java-hashtable-vs-concurrenthashmap)
 - [[<-- Prev]](/core-java-modules/core-java-concurrency-collections)