From b85fa39c07e15fc945903fa301541a55036e24e7 Mon Sep 17 00:00:00 2001
From: Qingshan Luo <edoger@qq.com>
Date: Mon, 10 May 2021 18:53:58 +0800
Subject: [PATCH] Add code comments.

---
 file_writer.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/file_writer.go b/file_writer.go
index d6b64dc..f49e4ed 100644
--- a/file_writer.go
+++ b/file_writer.go
@@ -93,6 +93,7 @@ func (w *fileWriter) swap() {
 		internal.EchoError("Failed to sync log file %s: %s.", w.name, err)
 		return
 	}
+	// On the windows platform, the file must be closed before renaming the file.
 	if err := w.fd.Close(); err != nil {
 		// We need to ignore the error that the file is closed.
 		if e, ok := err.(*os.PathError); !ok || e.Err != os.ErrClosed {