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 febc3b16bd..134f67d15d 100644
--- a/core-java-modules/core-java-string-operations-6/README.md
+++ b/core-java-modules/core-java-string-operations-6/README.md
@@ -7,3 +7,4 @@
 - [Fixing “constant string too long” Build Error](https://www.baeldung.com/java-constant-string-too-long-error)
 - [Compact Strings in Java 9](https://www.baeldung.com/java-9-compact-string)
 - [Split a String Into Digit and Non-Digit Substrings](https://www.baeldung.com/java-split-string-digits-letters)
+- [Check if a String Contains Non-Alphanumeric Characters](https://www.baeldung.com/java-string-test-special-characters)