diff --git a/core-java-modules/core-java-concurrency-advanced-4/README.md b/core-java-modules/core-java-concurrency-advanced-4/README.md
index db856a2cd6..446a553b88 100644
--- a/core-java-modules/core-java-concurrency-advanced-4/README.md
+++ b/core-java-modules/core-java-concurrency-advanced-4/README.md
@@ -3,3 +3,4 @@
 - [Binary Semaphore vs Reentrant Lock](https://www.baeldung.com/java-binary-semaphore-vs-reentrant-lock)
 - [Bad Practices With Synchronization](https://www.baeldung.com/java-synchronization-bad-practices)
 - [Start Two Threads at the Exact Same Time in Java](https://www.baeldung.com/java-start-two-threads-at-same-time)
+- [Volatile Variables and Thread Safety](https://www.baeldung.com/java-volatile-variables-thread-safety)