diff --git a/core-java-modules/core-java-9/README.md b/core-java-modules/core-java-9/README.md
index cab02369cc..8203755417 100644
--- a/core-java-modules/core-java-9/README.md
+++ b/core-java-modules/core-java-9/README.md
@@ -10,3 +10,4 @@ This module contains articles about Java 9 core features
 - [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
 - [Immutable ArrayList in Java](https://www.baeldung.com/java-immutable-list)
 - [Easy Ways to Write a Java InputStream to an OutputStream](https://www.baeldung.com/java-inputstream-to-outputstream)
+- [Private Methods in Java Interfaces](https://www.baeldung.com/java-interface-private-methods)