--- a
+++ b/docs/reference/index.md
@@ -0,0 +1,9 @@
+The reference provides background knowledge for working with ehrQL in your project.
+
+* [Language reference](language.md)
+* [Language features](features.md)
+* [Backends](backends.md)
+* [Table schemas](schemas.md)
+* [Command line interface](cli.md)
+* [Cheatsheet](cheatsheet.md)
+* [Upgrading ehrQL from v0 to v1](upgrading-ehrql-from-v0-to-v1.md)