Missing a known author for a picture book about Elmer

[Martina]

This book https://www.goodreads.com/book/show/2... has an author but it is not added : author is David McKee and the illustrator is Marysia Milewski as you can see on the cover photo. And it should be also added under Elmer series https://www.goodreads.com/series/7142... and here are the infos https://www.elmer.co.uk/books/

Thank you for your work. :)