diff --git a/crates/bevy_ecs/src/schedule/executor_parallel.rs b/crates/bevy_ecs/src/schedule/executor_parallel.rs
index 97252ddca3f1d1..5b9326ce9822db 100644
--- a/crates/bevy_ecs/src/schedule/executor_parallel.rs
+++ b/crates/bevy_ecs/src/schedule/executor_parallel.rs
@@ -190,10 +190,8 @@ impl ParallelExecutor {
                         .unwrap_or_else(|error| unreachable!("{}", error));
                     #[cfg(feature = "trace")]
                     let system_guard = system_span.enter();
-                    #[allow(clippy::undocumented_unsafe_blocks)] // TODO: document why this is safe
-                    unsafe {
-                        system.run_unsafe((), world)
-                    };
+                    // SAFETY: the executor prevents two systems with conflicting access from running simultaneously.
+                    unsafe { system.run_unsafe((), world) };
                     #[cfg(feature = "trace")]
                     drop(system_guard);
                     finish_sender