diff --git a/java-collections-maps-3/README.md b/java-collections-maps-3/README.md
index bd1029c9cf..9b1d8510c2 100644
--- a/java-collections-maps-3/README.md
+++ b/java-collections-maps-3/README.md
@@ -3,3 +3,4 @@
 - [Java Map With Case-Insensitive Keys](https://www.baeldung.com/java-map-with-case-insensitive-keys)
 - [Using a Byte Array as Map Key in Java](https://www.baeldung.com/java-map-key-byte-array)
 - [Using the Map.Entry Java Class](https://www.baeldung.com/java-map-entry)
+- [Optimizing HashMap’s Performance](https://www.baeldung.com/java-hashmap-optimize-performance)