Adding a 'Couple-a-Knots'

[safetypee]

The reply to the query “… if I want to add a couple of knots to my approach speed” could be:-

‘What’s the correction to the landing distance?’

A numerical answer is an opportunity to debrief the risks in approach and landing, distance margins, accuracy of declared runway state, etc.

Not providing an answer leads to a wider discussion on balancing risks, particularly the combination of speed and touchdown position, and thereafter stopping distance, wet runway, and overruns.

https://www.skybrary.aero/bookshelf/books/900.pdf table 6, page 11