From 577e0ef044325c5f08e774a63b248059b01d5cf3 Mon Sep 17 00:00:00 2001
From: johnA1331 <53036378+johnA1331@users.noreply.github.com>
Date: Wed, 28 Oct 2020 10:32:02 +0800
Subject: [PATCH] Update README.md

---
 core-java-modules/core-java-collections-3/README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/core-java-modules/core-java-collections-3/README.md b/core-java-modules/core-java-collections-3/README.md
index e21e3642f9..6bc9139856 100644
--- a/core-java-modules/core-java-collections-3/README.md
+++ b/core-java-modules/core-java-collections-3/README.md
@@ -14,3 +14,4 @@
 - [Convert an Array of Primitives to a List](https://www.baeldung.com/java-primitive-array-to-list)
 - [A Guide to BitSet in Java](https://www.baeldung.com/java-bitset)
 - [Get the First Key and Value From a HashMap](https://www.baeldung.com/java-hashmap-get-first-entry)
+- [Performance of removeAll() in a HashSet](https://www.baeldung.com/java-hashset-removeall-performance)