diff --git a/examples/example-types/src/lib.rs b/examples/example-types/src/lib.rs
index ea407af..5dc3e5c 100644
--- a/examples/example-types/src/lib.rs
+++ b/examples/example-types/src/lib.rs
@@ -19,7 +19,7 @@ where
     ObjectId(apub_core::object_id::ObjectId::new(id))
 }
 
-#[derive(Debug, serde::Deserialize, serde::Serialize)]
+#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
 pub enum NoteType {
     Note,
 }
@@ -54,6 +54,15 @@ impl<Kind> Display for ObjectId<Kind> {
     }
 }
 
+impl<Kind> From<Url> for ObjectId<Kind>
+where
+    Self: Dereference,
+{
+    fn from(url: Url) -> Self {
+        object_id::<Kind>(url)
+    }
+}
+
 impl Dereference for ObjectId<NoteType> {
     type Output = Note;