diff --git a/core-java-modules/core-java-string-operations-7/README.md b/core-java-modules/core-java-string-operations-7/README.md
index 9082591a31..c100b66ff7 100644
--- a/core-java-modules/core-java-string-operations-7/README.md
+++ b/core-java-modules/core-java-string-operations-7/README.md
@@ -13,3 +13,4 @@
 - [Comparing One String With Multiple Values in One Expression in Java](https://www.baeldung.com/java-compare-string-multiple-values-one-expression)
 - [UTF-8 Validation in Java](https://www.baeldung.com/java-utf-8-validation)
 - [Simple Morse Code Translation in Java](https://www.baeldung.com/java-morse-code-english-translate)
+- [How to Determine if a String Contains Invalid Encoded Characters](https://www.baeldung.com/java-check-string-contains-invalid-encoded-characters)