diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs
index 5d7968530..d14b9b6aa 100644
--- a/tokio/src/runtime/runtime.rs
+++ b/tokio/src/runtime/runtime.rs
@@ -260,6 +260,7 @@ impl Runtime {
     ///     println!("now running on a worker thread");
     /// });
     /// # }
+    /// ```
     #[track_caller]
     pub fn spawn_blocking<F, R>(&self, func: F) -> JoinHandle<R>
     where