# Objective
Improvement of the documentation for SystemParam derive section so that
it mentions how to use a Query<&SomeComponent> as a SystemParam for a
struct that should have #[derive(SystemParam)].
## Solution
Added the documentation
---
## Showcase
the previous documentation
```rust
Query<'w, 's, Entity>,
Res<'w, SomeResource>,
ResMut<'w, SomeOtherResource>,
Local<'s, u8>,
Commands<'w, 's>,
EventReader<'w, 's, SomeEvent>,
EventWriter<'w, SomeEvent>
```
the new documentation
```rust
Query<'w, 's, Entity>,
Query<'w, 's, &'static SomeComponent>, <================== the new thing
Res<'w, SomeResource>,
ResMut<'w, SomeOtherResource>,
Local<'s, u8>,
Commands<'w, 's>,
EventReader<'w, 's, SomeEvent>,
EventWriter<'w, SomeEvent>
```
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