diff --git a/src/stream/from_stream.rs b/src/stream/from_stream.rs
index 7a262f7..91d3e24 100644
--- a/src/stream/from_stream.rs
+++ b/src/stream/from_stream.rs
@@ -10,6 +10,7 @@ use std::pin::Pin;
 /// See also: [`IntoStream`].
 ///
 /// [`IntoStream`]: trait.IntoStream.html
+#[cfg_attr(feature = "docs", doc(cfg(unstable)))]
 pub trait FromStream<T: Send> {
     /// Creates a value from a stream.
     ///
diff --git a/src/stream/into_stream.rs b/src/stream/into_stream.rs
index 42f9529..b291317 100644
--- a/src/stream/into_stream.rs
+++ b/src/stream/into_stream.rs
@@ -13,6 +13,7 @@ use futures_core::stream::Stream;
 /// See also: [`FromStream`].
 ///
 /// [`FromStream`]: trait.FromStream.html
+#[cfg_attr(feature = "docs", doc(cfg(unstable)))]
 pub trait IntoStream {
     /// The type of the elements being iterated over.
     type Item;