From 31e9a54c19450656a08258870926b523ac1cf47b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alberto=20Cuesta=20Ca=C3=B1ada?= <mail@albertocuesta.es>
Date: Thu, 23 Jan 2020 20:46:52 +0000
Subject: [PATCH] Small comment.

---
 contracts/utils/EnumerableSet.sol | 1 +
 1 file changed, 1 insertion(+)

diff --git a/contracts/utils/EnumerableSet.sol b/contracts/utils/EnumerableSet.sol
index b206da5fc..292ed7078 100644
--- a/contracts/utils/EnumerableSet.sol
+++ b/contracts/utils/EnumerableSet.sol
@@ -44,6 +44,7 @@ library EnumerableSet {
         internal
     {
         require(contains(set, value), "EnumerableSet: value not in set");
+        // Replaced the value to remove with the last one in the array. O(1)
         set.values[set.index[value] - 1] = set.values[set.values.length - 1];
         set.values.pop();
         delete set.index[value];