diff --git a/core-java-modules/core-java-string-operations-5/README.md b/core-java-modules/core-java-string-operations-5/README.md
index 94fb7e855e..bbd63d1138 100644
--- a/core-java-modules/core-java-string-operations-5/README.md
+++ b/core-java-modules/core-java-string-operations-5/README.md
@@ -8,3 +8,4 @@
 - [Convert String to String Array](https://www.baeldung.com/java-convert-string-to-string-array)
 - [String Interpolation in Java](https://www.baeldung.com/java-string-interpolation)
 - [Guide to Splitting a String by Whitespace in Java](https://www.baeldung.com/java-splitting-a-string-by-whitespace)
+- [Check if the First Letter of a String Is a Number](https://www.baeldung.com/java-check-if-string-starts-with-number)