diff --git a/src/rstd.rs b/src/rstd.rs
index b6cee40..3753847 100644
--- a/src/rstd.rs
+++ b/src/rstd.rs
@@ -39,7 +39,9 @@ impl<S: Serializable> SerializableExt for S {
     }
 }
 
+/// [`ResolverExt::into_rc`].
 pub trait ResolverExt<'a, Ctx: Context<'a>>: Resolver<'a, Ctx> {
+    /// Wrap the resolver into [`Rc`].
     fn into_rc(self) -> Rc<dyn Resolver<'a, Ctx>>;
 }