Update README.md

rcalago · web-flow · commit 2687d01dc5b3 · 2024-03-13T14:56:45.000+08:00
diff --git a/libraries-4/README.md b/libraries-4/README.md
@@ -12,4 +12,5 @@ Remember, for advanced libraries like [Jackson](/jackson) and [JUnit](/testing-m
 - [Guide to JDeferred](https://www.baeldung.com/jdeferred)
 - [Introduction to MBassador](https://www.baeldung.com/mbassador)
 - [Using Pairs in Java](https://www.baeldung.com/java-pairs)
+- [Introduction to JFreeChart](https://www.baeldung.com/jfreechart-visualize-data)
 - More articles [[<-- prev]](/libraries-3)
