diff --git a/core-java-modules/core-java-string-operations-6/README.md b/core-java-modules/core-java-string-operations-6/README.md
index 190880a5dd..a6e5380424 100644
--- a/core-java-modules/core-java-string-operations-6/README.md
+++ b/core-java-modules/core-java-string-operations-6/README.md
@@ -2,3 +2,4 @@
 ### Relevant Articles:
 
 - [Find the Longest Word in a Given String in Java](https://www.baeldung.com/java-longest-word-string)
+- [Check if a String Is All Uppercase or Lowercase in Java](https://www.baeldung.com/java-check-string-uppercase-lowercase)