Dear Blue_on_the_time, the "changeset comment" field is where you explain to your fellow mappers what your edit is about. "a" is not a good description for a changeset with > 900 edits. A few more words would be good! See https://wiki.openstreetmap.org/wiki/Uk:%D0%A1%D1%82%D0%B2%D0%BE%D1%80%D0%B5%D0%BD%D0%BD%D1%8F_%D0%B3%D0%B0%D1%80%D0%BD%D0%B8%D1%85_%D0%BE%D0%BF%D0%B8%D1%81%D1%96%D0%B2_%D0%BD%D0%B0%D0%B1%D0%BE%D1%80%D1%96%D0%B2_%D0%B7%D0%BC%D1%96%D0%BD for details.