diff --git a/core-groovy-2/README.md b/core-groovy-2/README.md
index f1984f18f4..95a00a1f5b 100644
--- a/core-groovy-2/README.md
+++ b/core-groovy-2/README.md
@@ -12,4 +12,5 @@ This module contains articles about core Groovy concepts
 - [Concatenate Strings with Groovy](https://www.baeldung.com/groovy-concatenate-strings)
 - [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)
 - [[<-- Prev]](/core-groovy)