diff --git a/core-java-modules/core-java-string-apis-2/README.md b/core-java-modules/core-java-string-apis-2/README.md
index 9c63838268..5476e91169 100644
--- a/core-java-modules/core-java-string-apis-2/README.md
+++ b/core-java-modules/core-java-string-apis-2/README.md
@@ -3,3 +3,4 @@
 This module contains articles about string APIs.
 
 ### Relevant Articles:
+- [Retain Only Digits and Decimal Separator in String](https://www.baeldung.com/java-string-retain-digits-decimal)