diff --git a/core-java-modules/core-java-collections-maps-6/README.md b/core-java-modules/core-java-collections-maps-6/README.md
index 7bd1d5ea11..dacd13e7dc 100644
--- a/core-java-modules/core-java-collections-maps-6/README.md
+++ b/core-java-modules/core-java-collections-maps-6/README.md
@@ -5,3 +5,4 @@
 - [Converting Object To Map in Java](https://www.baeldung.com/java-convert-object-to-map)
 - [Difference Between Map.clear() and Instantiating a New Map](https://www.baeldung.com/java-map-clear-vs-new-map)
 - [Converting JsonNode Object to Map](https://www.baeldung.com/jackson-jsonnode-map)
+- [How to Modify a Key in a HashMap?](https://www.baeldung.com/java-hashmap-modify-key)