diff --git a/java-numbers-4/README.md b/java-numbers-4/README.md
index f053a82b80..a6d866218c 100644
--- a/java-numbers-4/README.md
+++ b/java-numbers-4/README.md
@@ -4,3 +4,4 @@
 - [Understanding the & 0xff Value in Java](https://www.baeldung.com/java-and-0xff)
 - [Determine if an Integer’s Square Root Is an Integer in Java](https://www.baeldung.com/java-find-if-square-root-is-integer)
 - [Guide to Java BigInteger](https://www.baeldung.com/java-biginteger)
+- [Automorphic Numbers in Java](https://www.baeldung.com/java-automorphic-numbers)