In this paper, I consider the semantics of a modifier infinitive in English, related to the more widely discussed Rationale Clause (see especially Faraci 1974, Jones 1991). I argue that the semantics of this infinitive (a Telic Clause) derives from the properties of the predicate which heads it (TELOS). I characterize TELOS, within a Davidsonian event semantics, as a pure relation between events and argue against the view that the word only, which often prefaces the Telic Clause, is in fact the head of the construction. I explore the conditions on reference which apply to TELOS. As well as offering an account of a little-discussed construction, therefore, this paper is intended as a contribution to our understanding of the place of argument structure in event semantics.