There is a growing interest in using automatic grammar checkers for English language teaching. To find the optimal way of using machine corrective feedback, the researcher experimented with 75 second-year university students. They received three types of feedback: machine feedback by Grammarly, indirect written feedback with marking, and direct written feedback with correct forms. Students’ views collected through a post-questionnaire suggested the complementary use of Grammarly could raise students’ satisfaction levels while lowering teachers’ burden.