 Since the actuality operator rigidly designates actual situations, the truth-value of statements of the form \(\A p\) will not vary across possible situations. ‘\(\A p\)’ entails ‘in every situation \(\A p\)’. Thus, as Edgington is aware, if \(\A p\) then it is necessary that \(\A p\). This by itself poses a problem for EKP. The criticism is that Edgington’s approach is not general enough. Anyone who is likely to endorse the knowability principle is likely to think that it holds of all truths, not just those necessary truths involving the actuality operator. EKP appears to be a very limited thesis failing to specify an epistemic constraint on contingent truth (Williamson 1987a).