The England youth international made his first start for the Bundesliga after joining from Sunderland earlier this month and marked the occasion with a goal in their 4-3 win over South Africans.
The 19-year-old revealed that his was a move he had practised, making it all the more satisfying to execute in a match.
"It's a really nice bonus. I am glad we won but there are still a lot of things for me to improve on personally and for the team. I am really pleased with it," Bellingham told Dazn.
"I practise that so many times, not that exact finish, but arriving late on the edge of the box as a midfielder is something you need to be really good at.
“If you can score, if you can contribute those kind of goals a certain amount per season then you are doing really well. I was really pleased because it was something I practised as a kid and at Sunderland so many times, during training, after training. So yeah, I am really proud of it."