>:c

Author: BoxyUwU

crates/bevy_ecs/src/query/fetch.rs

@@ -143,7 +143,7 @@ use std::{cell::UnsafeCell, marker::PhantomData};
 /// # bevy_ecs::system::assert_is_system(my_system);
 /// ```
 ///
-/// Mutable queries will also have a ReadOnly version derived:
+/// Mutable queries will also have a read only version derived:
 /// ```rust
 /// # use bevy_ecs::prelude::*;
 /// use bevy_ecs::query::WorldQuery;
@@ -354,6 +354,13 @@ pub trait WorldQueryGats<'world> {
 ///
 /// Every type that implements [`WorldQuery`] have their associated [`WorldQuery::Fetch`](WorldQueryGats::Fetch)  and
 /// [`WorldQuery::State`] types that are essential for fetching component data.
+///
+/// Safety
+///
+/// Implementor must ensure that [`Fetch::update_component_access`] and
+/// [`Fetch::update_archetype_component_access`] exactly reflects the results of
+/// [`FetchState::matches_component_set`], [`Fetch::archetype_fetch`], and
+/// [`Fetch::table_fetch`].
 pub unsafe trait Fetch<'world>: Sized {
     type Item;
     type State: FetchState;