diff --git a/executor/write_test.go b/executor/write_test.go
index 8ac7f2fad104d..cfdcf7f1f4d95 100644
--- a/executor/write_test.go
+++ b/executor/write_test.go
@@ -2103,6 +2103,7 @@ func TestLoadDataEscape(t *testing.T) {
 		{nil, []byte("7\trtn0ZbN\n"), []string{"7|" + string([]byte{'r', 't', 'n', '0', 'Z', 'b', 'N'})}, nil, trivialMsg},
 		{nil, []byte("8\trtn0Zb\\N\n"), []string{"8|" + string([]byte{'r', 't', 'n', '0', 'Z', 'b', 'N'})}, nil, trivialMsg},
 		{nil, []byte("9\ttab\\	tab\n"), []string{"9|tab	tab"}, nil, trivialMsg},
+		// data broken at escape character.
 		{[]byte("1\ta string\\"), []byte("\n1\n"), []string{"1|a string\n1"}, nil, trivialMsg},
 	}
 	deleteSQL := "delete from load_data_test"