I’m not sure how to explain without outing myself but this is the closest example I can think of.
Say I was employed to manage a fruit and veg shop .. I manage two part time staff . Have successfully done this for years and years.
Now HO have decided that we will need to offer deliveries ( not something we’ve ever done ) in a large radius of the county. A driver will be employed and I will manage them and their vehicle , I will organise orders , advertise then gather the orders , deal with routes etc
I feel that this changes my contract and job responsibilities. Although I am more than able to do this , time will be an issue and also the extra work at no extra salary.
How do I word this expectation without sounding whiney or being awkward about this expansion that they are excited about.