It is this:
When you mention the Prophet Mohammed's name, is it always 'peace be upon him' or is it sometimes 'praise be upon him'?
I ask because I am proof-reading a book for a (non-Muslim, but very concerned to show respect to other people's beliefs) colleague and she has put 'praise be upon him', which I have never seen before.
Is this "wrong" in any sense or just a normal alternative?
Many thanks.