diff --git a/core-groovy-2/README.md b/core-groovy-2/README.md
index 95a00a1f5b..9f81ac6c16 100644
--- a/core-groovy-2/README.md
+++ b/core-groovy-2/README.md
@@ -13,4 +13,5 @@ This module contains articles about core Groovy concepts
 - [Metaprogramming in Groovy](https://www.baeldung.com/groovy-metaprogramming)
 - [A Quick Guide to Working with Web Services in Groovy](https://www.baeldung.com/groovy-web-services)
 - [Categories in Groovy](https://www.baeldung.com/groovy-categories)
+- [How to Determine the Data Type in Groovy](https://www.baeldung.com/groovy-determine-data-type)
 - [[<-- Prev]](/core-groovy)