Notes Field In Channel API Settings Page

Could we please have a simple notes field in the API settings page?
My scenario. I have an overall uplift percentage on Booking.com but one property on the API is in a very competitive market so I don't want the same increase. As booking.com doesn't do discounts via the API I have a promotion of 5% set directly in the Booking dashboard. It would be really helpful to be able to make a note of this in the OR API settings as it is highly likely I will have forgotten my setup in 6 months' time.