diff --git a/src/rcore.rs b/src/rcore.rs
index a1c9465..0417ddd 100644
--- a/src/rcore.rs
+++ b/src/rcore.rs
@@ -61,6 +61,7 @@ pub trait Mentionable<'a, Ctx: Context<'a>>: 'a + Serializable {
     fn points_typed(&self, points: &mut impl TakesPoints<'a, Ctx>);
 }
 
+/// [`Factory`] associated with the [`Mentionable`]. Mostly useful for `type` definitions.
 pub type Fctr<'a, Ctx, A> = <A as Mentionable<'a, Ctx>>::Fctr;
 
 /// Shorthand for the type of vaalues returned by [`Factory::deserialize`].