 Other sorts of modal operators have been added to relevance logic as well. Fuhrmann (1990) adapts the usual axioms for the familiar classical modal logics to the relevant context to produce a collection of relevant modal logics and proves completeness results for them. Epistemic modal operators have been added to relevance logics by Heinrich Wansing (2002), Marta Bilkova, Ondrej Majer, Michal Peliš, and Greg Restall (2010), among others. Shawn Standefer (2019) has produced a relevant version of justification logic and has very recently added an actuality opertor to relevance logic. There is even a relevant logic of questions and answers (see Punčochář 2020).