diff --git a/core-java-9/README.md b/core-java-9/README.md
index 90cd8a8347..2a00f8fe98 100644
--- a/core-java-9/README.md
+++ b/core-java-9/README.md
@@ -23,4 +23,5 @@
 - [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)
 - [Java 9 java.util.Objects Additions](https://www.baeldung.com/java-9-objects-new)
 - [Java 9 Reactive Streams](https://www.baeldung.com/java-9-reactive-streams)
+- [Java 9 Optional API Additions](https://www.baeldung.com/java-9-optional)