From 6ba334b4820bd2b4d1e837c2c69d8dfbae672586 Mon Sep 17 00:00:00 2001
From: djshow832 <873581766@qq.com>
Date: Tue, 21 Jun 2022 15:57:26 +0800
Subject: [PATCH] fix comments

---
 session/session.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/session/session.go b/session/session.go
index af1b067fe035e..3f163146e8796 100644
--- a/session/session.go
+++ b/session/session.go
@@ -3506,7 +3506,8 @@ func (s *session) EncodeSessionStates(ctx context.Context, sctx sessionctx.Conte
 	for _, sv := range variable.GetSysVars() {
 		switch {
 		case sv.Hidden, sv.HasNoneScope(), sv.HasInstanceScope(), !sv.HasSessionScope():
-			// Hidden, none-scoped, and instance-scoped variables cannot be modified.
+			// Hidden and none-scoped variables cannot be modified.
+			// Instance-scoped variables don't need to be encoded.
 			// Noop variables should also be migrated even if they are noop.
 			continue
 		case sv.ReadOnly: