From 61bfb9e60cc2eb75f7fa18561c046b9c4bdf1fe5 Mon Sep 17 00:00:00 2001
From: Anton Firszov <antonfir@gmail.com>
Date: Fri, 19 Nov 2021 11:07:56 +0100
Subject: [PATCH] add comment on ColorDistanceCache member

---
 .../Processors/Quantization/EuclideanPixelMap{TPixel}.cs        | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ImageSharp/Processing/Processors/Quantization/EuclideanPixelMap{TPixel}.cs b/src/ImageSharp/Processing/Processors/Quantization/EuclideanPixelMap{TPixel}.cs
index cac11b4a8..f54489348 100644
--- a/src/ImageSharp/Processing/Processors/Quantization/EuclideanPixelMap{TPixel}.cs
+++ b/src/ImageSharp/Processing/Processors/Quantization/EuclideanPixelMap{TPixel}.cs
@@ -22,6 +22,8 @@ namespace SixLabors.ImageSharp.Processing.Processors.Quantization
         where TPixel : unmanaged, IPixel<TPixel>
     {
         private Rgba32[] rgbaPalette;
+
+        // Do not make this readonly! Struct value would be always copied on non-readonly method calls.
         private ColorDistanceCache cache;
         private readonly Configuration configuration;