diff --git a/src/lib.rs b/src/lib.rs
index b94db7d..3af6feb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -145,9 +145,16 @@
 //!                     MutexKey
 //!                     (scope)
 //!                        │
+//!                        ├───▶ MutexGuard(s)
+//!                        │      (access)
 //!                        ▼
-//!                    MutexGuard
-//!                     (access)
+//!                     MutexKey
+//!                    (subscope)
+//!                        │
+//!                        ├───▶ MutexGuard(s)
+//!                        │      (access)
+//!                        ▼
+//!                       ...
 //! ```
 //!
 //! | Type                                            | Role                                       | Created by                                                                                             |