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+# Appendix
+
+## GraphQL API
+
+Hetty exposes a GraphQL API over HTTP for managing all its features. This API is
+used by the web admin interface; a Next.js app using Apollo Client.
+
+### Playground
+
+You can also introspect and manually experiment with the API via the included GraphQL Playground. To access it, start Hetty and visit: [http://localhost:8080/api/playground](http://localhost:8080/api/playground).
+
+### Schema
+
+<<< @/../pkg/api/schema.graphql
+
+Source: [pkg/api/schema.graphql](https://github.com/dstotijn/hetty/blob/master/pkg/api/schema.graphql)
+
+## License
+
+MIT License
+
+Copyright (c) 2020 David Stotijn
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.