I am a PhD student and my supervisor has asked me to make some significant contributions to a book which he is trying to publish.
He has asked me to proof read the book (English is my native language but is not his) but has also asked if I could effectively rewrite some sections to make improve the communication and structure of the book.
I am happy to do the work but would like to agree beforehand how my contribution should be recognised. As I will not be contributing any technical knowledge to the book I feel that co-authorship is not appropriate, especially as the book will be aimed at experts in the area so the content is more important than the communication. However, I would expect more than, say, a mention in an acknowledgements section.
Does there exist some sort of compromise between co-authorship and an acknowledgement which would better reflect my contribution?