From 94190286ff3e2eab1f9bb5a0ee7181343ee530ca Mon Sep 17 00:00:00 2001
From: Xiang Li <xiang.li@coreos.com>
Date: Mon, 24 Nov 2014 09:05:40 -0800
Subject: [PATCH] raft: add comment for append in unstableEntries in log.go

---
 raft/log.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/raft/log.go b/raft/log.go
index 1c4690301..9815a2b32 100644
--- a/raft/log.go
+++ b/raft/log.go
@@ -133,6 +133,7 @@ func (l *raftLog) unstableEntries() []pb.Entry {
 	if len(l.unstableEnts) == 0 {
 		return nil
 	}
+	// copy unstable entries to an empty slice
 	return append([]pb.Entry{}, l.unstableEnts...)
 }