diff --git a/library/alloc/src/rc.rs b/library/alloc/src/rc.rs
index 0b57c36247e..d0d37c08d13 100644
--- a/library/alloc/src/rc.rs
+++ b/library/alloc/src/rc.rs
@@ -393,7 +393,7 @@ impl<T> Rc<T> {
     /// # Examples
     ///
     /// ```
-    /// #![allow(dead_code)]
+    /// # #![allow(dead_code)]
     /// use std::rc::{Rc, Weak};
     ///
     /// struct Gadget {