1 files changed, 6 insertions, 1 deletions
diff --git a/src/lib.rs b/src/lib.rs
index 6d58135..c99c68b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -79,9 +79,11 @@
 //!
 //! # Cargo features
 //!
-//! This crate supports two cargo features:
+//! This crate supports three cargo features:
 //!
 //! - `owning_ref`: Allows your lock types to be used with the `owning_ref` crate.
+//! - `arc_lock`: Enables locking from an `Arc`. This enables types such as `ArcMutexGuard`. Note that this
+//!   requires the `alloc` crate to be present.
 //! - `nightly`: Enables nightly-only features. At the moment the only such
 //!   feature is `const fn` constructors for lock types.
 
@@ -93,6 +95,9 @@
 #[macro_use]
 extern crate scopeguard;
 
+#[cfg(feature = "arc_lock")]
+extern crate alloc;
+
 /// Marker type which indicates that the Guard type for a lock is `Send`.
 pub struct GuardSend(());