diff --git a/core-java-modules/core-java-security-3/README.md b/core-java-modules/core-java-security-3/README.md
index 222834d06b..91f48ff547 100644
--- a/core-java-modules/core-java-security-3/README.md
+++ b/core-java-modules/core-java-security-3/README.md
@@ -13,4 +13,5 @@ This module contains articles about core Java Security
 - [Error: “trustAnchors parameter must be non-empty”](https://www.baeldung.com/java-trustanchors-parameter-must-be-non-empty)
 - [Common Exceptions of Crypto APIs in Java](https://www.baeldung.com/java-crypto-apis-exceptions)
 - [Hashing With Argon2 in Java](https://www.baeldung.com/java-argon2-hashing)
+- [Hex Representation of a SHA-1 Digest of a String in Java](https://www.baeldung.com/java-string-sha1-hexadecimal)
 - More articles: [[<-- prev]](/core-java-modules/core-java-security-2)