From ff11917fa8bc7078a6fe452ec82b25b711b7fb88 Mon Sep 17 00:00:00 2001
From: whr819987540 <819987540@qq.com>
Date: Thu, 27 Apr 2023 10:38:37 +0800
Subject: [PATCH] add comment to ChoosePieceLength

---
 metainfo/piece-length.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/metainfo/piece-length.go b/metainfo/piece-length.go
index 183b4d86..c483e037 100644
--- a/metainfo/piece-length.go
+++ b/metainfo/piece-length.go
@@ -41,6 +41,9 @@ const (
 const targetPieceCountMax = targetPieceCountMin << 1
 
 // Choose a good piecelength.
+// piecelength >= 16KB
+// piecelength = 16KB*X
+// totalLength / piecelength = piecenumber < 2048
 func ChoosePieceLength(totalLength int64) (pieceLength int64) {
 	// Must be a power of 2.
 	// Must be a multiple of 16KB