diff --git a/README.md b/README.md
index d62de38..bfde5e7 100644
--- a/README.md
+++ b/README.md
@@ -226,6 +226,9 @@ async fn group_one_timeout_override(#[case] delay: Duration, #[case] expected: u
 }
 ```
 
+If you want to use `timeout` for `async` test you need to use `async-timeout`
+feature (enabled by default).
+
 ### Inject Test Attribute
 
 If you would like to use another `test` attribute for your test you can simply 
diff --git a/rstest/src/lib.rs b/rstest/src/lib.rs
index e11e300..adf9e65 100644
--- a/rstest/src/lib.rs
+++ b/rstest/src/lib.rs
@@ -226,6 +226,14 @@
 //! }
 //! ```
 //! You can use this feature also in value list and in fixture default value.
+//!
+//! # Optional features
+//!
+//! `rstest` Enable all fetures by default. You can disable them if you need to
+//! speed up compilation.
+//!
+//! - **`async-timeout`** *(enabled by default)* — Implement timeout for async
+//! tests.
 
 #[doc(hidden)]
 pub mod magic_conversion;
diff --git a/rstest_macros/src/lib.rs b/rstest_macros/src/lib.rs
index 46818a2..cc9f67b 100644
--- a/rstest_macros/src/lib.rs
+++ b/rstest_macros/src/lib.rs
@@ -782,6 +782,9 @@ pub fn fixture(
 /// }
 /// ```
 ///
+/// If you want to use `timeout` for `async` test you need to use `async-timeout`
+/// feature (enabled by default).
+///
 /// ## Inject Test Attribute
 ///
 /// If you would like to use another `test` attribute for your test you can simply