diff --git a/core-java-modules/core-java-string-operations-3/README.md b/core-java-modules/core-java-string-operations-3/README.md
index ad4ada3a68..ff6ac51fab 100644
--- a/core-java-modules/core-java-string-operations-3/README.md
+++ b/core-java-modules/core-java-string-operations-3/README.md
@@ -4,3 +4,4 @@
 - [Java (String) or .toString()?](https://www.baeldung.com/java-string-casting-vs-tostring)
 - [Split Java String by Newline](https://www.baeldung.com/java-string-split-by-newline)
 - [Split a String in Java and Keep the Delimiters](https://www.baeldung.com/java-split-string-keep-delimiters)
+- [Validate String as Filename in Java](https://www.baeldung.com/java-validate-filename)