--- title: Extending the schema summary: Add new functionality to the schema --- In this section of the documentation, we'll look at some advanced features for developers who want to extend their GraphQL server using custom models, middleware, and new operations. [CHILDREN] [alert] You are viewing docs for a pre-release version of silverstripe/graphql (4.x). Help us improve it by joining #graphql on the [Community Slack](https://www.silverstripe.org/blog/community-slack-channel/), and report any issues at [github.com/silverstripe/silverstripe-graphql](https://github.com/silverstripe/silverstripe-graphql). Docs for the current stable version (3.x) can be found [here](https://github.com/silverstripe/silverstripe-graphql/tree/3) [/alert]