diff --git a/src/rcore/resolution.rs b/src/rcore/resolution.rs
index f4de099..668419a 100644
--- a/src/rcore/resolution.rs
+++ b/src/rcore/resolution.rs
@@ -19,6 +19,7 @@ impl<L, P> ResolutionError<L, P> {
     }
 }
 
+/// [`Context::LookupError`]. Mostly useful for `type` definitions.
 pub type LookupError<'a, Ctx> = <Ctx as Context<'a>>::LookupError;
 
 /// See [`ResolutionResult`].