 The complaint that on the mapping conception, narrow contents are not truth conditional, and hence perhaps should not be called “contents” at all, can be met by an interesting twist on the mapping conception. Instead of considering a function from contexts of acquisition to broad contents in its full generality, we can focus our attention on a narrower function, the “diagonal proposition” determined by a Fodorian narrow content. The idea, and the term “diagonal proposition,” were originally introduced by Robert Stalnaker in a different context (Stalnaker 1999, especially papers 4, 6, and 7), but it turns out to be useful here. It is not clear that anyone has actually proposed this idea as an account of narrow content, but Stalnaker has suggested it as an interpretation of Loar’s view (Stalnaker 1990, discussing Loar 1988), and the view of Chalmers (1996) has sometimes been understood in this way (e.g. by Block and Stalnaker 1999).