diff --git a/core-java-modules/core-java-io-4/README.md b/core-java-modules/core-java-io-4/README.md
index 263077946d..738cbb5895 100644
--- a/core-java-modules/core-java-io-4/README.md
+++ b/core-java-modules/core-java-io-4/README.md
@@ -13,5 +13,6 @@ This module contains articles about core Java input and output (IO)
 - [Generate the MD5 Checksum for a File in Java](https://www.baeldung.com/java-md5-checksum-file)
 - [Getting the Filename From a String Containing an Absolute File Path](https://www.baeldung.com/java-filename-full-path)
 - [Mocking Java InputStream Object](https://www.baeldung.com/java-mocking-inputstream)
+- [PrintStream vs PrintWriter in Java](https://www.baeldung.com/java-printstream-vs-printwriter)
 - [[<-- Prev]](/core-java-modules/core-java-io-3)