diff --git a/README.md b/README.md
index 5429bc0..ef2aa2e 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ use std::collections::BTreeMap;
 use std::hash::Hash;
 use serde::Serialize;
 
-#[derive(Serialize)]
+#[derive(Copy, Clone, PartialOrd, Ord, Serialize)]
 struct AppId(u32);
 
 #[derive(Serialize)]
diff --git a/src/lib.rs b/src/lib.rs
index 204e8c6..a37cfd7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -19,7 +19,7 @@
 //! use std::hash::Hash;
 //! use serde::Serialize;
 //!
-//! #[derive(Serialize)]
+//! #[derive(Copy, Clone, PartialOrd, Ord, Serialize)]
 //! struct AppId(u32);
 //!
 //! #[derive(Serialize)]