diff --git a/rust/kernel/sync/lock.rs b/rust/kernel/sync/lock.rs
index f6c34ca4d819f..0c72677233946 100644
--- a/rust/kernel/sync/lock.rs
+++ b/rust/kernel/sync/lock.rs
@@ -38,6 +38,9 @@ pub unsafe trait Backend {
/// [`unlock`]: Backend::unlock
type GuardState;
+ /// The context which much be provided to acquire the lock.