diff --git a/loop.go b/loop.go
index eb5bd2a..41cf921 100644
--- a/loop.go
+++ b/loop.go
@@ -172,7 +172,9 @@ func (ss *session) Loop(ctx context.Context, commandIn commandIn) error {
 			} else {
 				err = ErrInvalidRollback
 			}
-		case "SAVEPOINT", "SAVE", "RELEASE":
+
+		// Executable but return nothing, safe in transaction
+		case "SAVEPOINT", "SAVE", "RELEASE", "SET":
 			misc.Echo(ss.spool, query)
 			err = doTCL(ctx, ss, query)
 
diff --git a/release_note_en.md b/release_note_en.md
index b866c67..4dfb323 100644
--- a/release_note_en.md
+++ b/release_note_en.md
@@ -6,7 +6,7 @@
 
 ### Specification Changes
 
-- Enable `RELEASE SAVEPOINT`(#19) and `REPLACE INTO`(#20,MySQL) to execute within a transaction. 
+- Enable `RELEASE SAVEPOINT`(#19), `REPLACE INTO`(#20,MySQL) and `SET`(#21) to execute within a transaction. 
 
 v0.26.0
 =======
diff --git a/release_note_ja.md b/release_note_ja.md
index a2c5fae..dac6fc8 100644
--- a/release_note_ja.md
+++ b/release_note_ja.md
@@ -6,7 +6,7 @@
 
 ### 仕様変更
 
-- `RELEASE SAVEPOINT` (#19), `REPLACE INTO` (#20,MySQL) もトランザクション内で実行できるようにした。
+- `RELEASE SAVEPOINT` (#19), `REPLACE INTO` (#20,MySQL), `SET`(#21) もトランザクション内で実行できるようにした。
 
 v0.26.0
 =======