diff --git a/src/rt/mod.rs b/src/rt/mod.rs
index db03edc260..4e3b986dad 100644
--- a/src/rt/mod.rs
+++ b/src/rt/mod.rs
@@ -22,6 +22,7 @@ use std::{
 /// ```
 /// # use hyper::rt::Executor;
 /// # use std::future::Future;
+/// #[derive(Clone)]
 /// struct TokioExecutor;
 ///
 /// impl<F> Executor<F> for TokioExecutor