# \[Sync] and \[Command] Attributes

Aside from configuring your CoherenceSync bindings from within the Configure window, it's possible to use the `[Sync]` and `[Command]` C# attributes directly on your scripts. Your prefabs will get updated to **require** such bindings.

## Sync Attribute

Mark **public** fields and properties to be synchronized over the network.

```csharp
[Sync]
public int health;
```

It's possible to migrate the variable automatically, if you decide to change its definition:

```csharp
[Sync("health")]
public float hp;
```

## Command Attribute

Mark **public** methods to be invoked over the network. Method return type must be `void`.

```csharp
[Command]
public void Heal(int amount)
{
    ...
}
```

It's possible to migrate the command automatically, if you decide to change the method signature:

```csharp
[Command("Heal", typeof(int))]
public void IncreaseHp(float hp)
{
    ...
}
```


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