diff --git a/src/rcore.rs b/src/rcore.rs
index 9efa3f3..1f0ef02 100644
--- a/src/rcore.rs
+++ b/src/rcore.rs
@@ -86,6 +86,7 @@ pub trait Factory<'a, Ctx: Context<'a>>: 'a + Send + Sync + Clone {
 /// [`Mentionable`] associated with the [`Factory`]. Mostly useful for `type` definitions.
 pub type Mtbl<'a, Ctx, F> = <F as Factory<'a, Ctx>>::Mtbl;
 
+/// [`Factory::ParseError`]. Mostly useful for `type` definitions.
 pub type ParseError<'a, Ctx, F> = <F as Factory<'a, Ctx>>::ParseError;
 
 pub type ParseErrorA<'a, Ctx, A> = ParseError<'a, Ctx, Fctr<'a, Ctx, A>>;