---
layout: stdlib-reference
---

# attribute [require]

## Description

Mark declaration to require a specific target capability.

## Signature

<pre>
[<a href="require.html">require</a>(<a href="require.html#decl-capability" class="code_param">capability</a>)]
</pre>

## Parameters

####  <a id="decl-capability"></a>capability
The required capability.