diff --git a/rand_core/src/lib.rs b/rand_core/src/lib.rs
index a5a7fb150c..292c57ffb8 100644
--- a/rand_core/src/lib.rs
+++ b/rand_core/src/lib.rs
@@ -245,6 +245,7 @@ pub trait SeedableRng: Sized {
     ///
     /// const N: usize = 64;
     /// pub struct MyRngSeed(pub [u8; N]);
+    /// # #[allow(dead_code)]
     /// pub struct MyRng(MyRngSeed);
     ///
     /// impl Default for MyRngSeed {