diff --git a/docs/index.md b/docs/index.md
index ccdb23b..48d5e5a 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -1 +1,12 @@
 # Documentation Index
+
+* [build.md](build.md) contains a detailed description on how the
+  build system works.
+* [layers.md](layers.md) contains a listing and description of the
+  available configuration layers and products in the build system.
+* [filesystem.md](filesystem.md) contains an outline of the filesystem
+  in the target image.
+* [boot.md](boot.md) contains a description on how the system boots and
+  mounts the filesystem root.
+* [update.md](update.md) does not yet contain a description on how the
+  system is intended to safely update itself during operation.