"Supermarket" probably isn't the best tag - I've changed it to "HVAC Workplace" instead. I've also merged the node you created with the building area encompassing it.

Leave a comment on my changeset if you think either of these changes is inappropriate - I'm happy to work together to create the most accurate mapping possible.
https://www.openstreetmap.org/changeset/152345468

Thanks for contributing to the map! 