diff --git a/src/concurrency/shared_state.md b/src/concurrency/shared_state.md
index bb59b8fe..73b5d101 100644
--- a/src/concurrency/shared_state.md
+++ b/src/concurrency/shared_state.md
@@ -3,9 +3,9 @@
 Rust uses the type system to enforce synchronization of shared data. This is
 primarily done via two types:
 
-* [`Arc<T>`][1], atomic reference counted `T`: handled sharing between threads and
-  takes care to deallocate `T` when the last thread exits,
-* [`Mutex<T>`][2]: ensures mutual exclusion access to the `T` value.
+* [`Arc<T>`][1], atomic reference counted `T`: handles sharing between threads and
+  takes care to deallocate `T` when the last reference is dropped,
+* [`Mutex<T>`][2]: ensures mutually exclusive access to the `T` value.
 
 [1]: https://doc.rust-lang.org/std/sync/struct.Arc.html
 [2]: https://doc.rust-lang.org/std/sync/struct.Mutex.html