diff --git a/src/future/into_future.rs b/src/future/into_future.rs
index aa23b5d7f..58b676615 100644
--- a/src/future/into_future.rs
+++ b/src/future/into_future.rs
@@ -30,6 +30,8 @@ use crate::future::Future;
 ///     }
 /// }
 /// ```
+#[cfg(any(feature = "unstable", feature = "docs"))]
+#[cfg_attr(feature = "docs", doc(cfg(unstable)))]
 pub trait IntoFuture {
     /// The type of value produced on completion.
     type Output;