Full Idea
Ethical descriptivism is the view that ethical sentence-meaning is wholly determined by truth-conditions. …Prescriptivists think there is a further element of meaning, which expresses prescriptions or evaluations or attitudes which we assent to.
Gist of Idea
Descriptivism say ethical meaning is just truth-conditions; prescriptivism adds an evaluation
Source
Richard M. Hare (Universal Prescriptivism [1991], p.452)
Book Reference
'A Companion to Ethics', ed/tr. Singer,Peter [Blackwell 1993], p.452
A Reaction
Not sure I understand either of these. If all meaning consists of truth-conditions, that will apply to ethics. If meaning includes evaluations, that will apply to non-ethics.