From f5a39308a00278b82cb312f5dbb2057d7ec795a8 Mon Sep 17 00:00:00 2001
From: Sam Brannen <sam@sambrannen.com>
Date: Tue, 31 Jan 2023 11:54:21 +0100
Subject: [PATCH] Polishing

---
 .../java/org/springframework/format/datetime/DateFormatter.java  | 1 +
 1 file changed, 1 insertion(+)

diff --git a/spring-context/src/main/java/org/springframework/format/datetime/DateFormatter.java b/spring-context/src/main/java/org/springframework/format/datetime/DateFormatter.java
index e065642326..06a95b7bee 100644
--- a/spring-context/src/main/java/org/springframework/format/datetime/DateFormatter.java
+++ b/spring-context/src/main/java/org/springframework/format/datetime/DateFormatter.java
@@ -49,6 +49,7 @@ public class DateFormatter implements Formatter<Date> {
 
 	private static final TimeZone UTC = TimeZone.getTimeZone("UTC");
 
+	// We use an EnumMap instead of Map.of(...) since the former provides better performance.
 	private static final Map<ISO, String> ISO_PATTERNS;
 
 	static {