A propositional content condition is a limitation on the nature of the state of affairs described by the propositional content of an illocutionary act due to the nature of the illocutionary force employed
The condition in a commissive act that the commitment to an action must concern a future state of affairs is a propositional content condition.
Searle, John, and Daniel Vanderveken. 1985.Foundations of illocutionary logic. Cambridge, England: Cambridge University.