diff --git a/src/Downloader/ChunkDownloader.cs b/src/Downloader/ChunkDownloader.cs
index b2779fd0..7a0ed7d6 100644
--- a/src/Downloader/ChunkDownloader.cs
+++ b/src/Downloader/ChunkDownloader.cs
@@ -122,6 +122,7 @@ internal async Task ReadStream(Stream stream, PauseToken pauseToken, Cancellatio
             CancellationToken? innerToken = null;
             try
             {
+                // close stream on cancellation because, it's not work on .Net Framework
                 using (cancelToken.Register(stream.Close))
                 {
                     while (CanReadStream() && readSize > 0)