title: How do I add a description to a field in "GraphQL schema language"
body: <p>I have a graphql schema, a fragment of which looks like this:</p>
  
  <pre><code>type User {
      username: String!
      password: String!
  }
  </code></pre>
  
  <p>In graphiql, there is a description field, but it always says "self-descriptive". How do I add descriptions to the schema? </p>