diff --git a/README.md b/README.md
index 2785994c..681bdfb0 100644
--- a/README.md
+++ b/README.md
@@ -2,3 +2,10 @@
 Cryptographic filesystem for the cloud
 
 See http://www.cryfs.org
+
+This repository contains the filesystem implementation. There are submodules in the following repositores:
+
+  - [Blockstore](https://github.com/cryfs/blockstore): Store (encrypted) fixed-size blocks of data in different backends
+  - [Blobstore](https://github.com/cryfs/blobstore): Store resizeable blobs of data using blocks from a blockstore
+  - [ParallelAccessStore](https://github.com/cryfs/parallelaccessstore): Concurrency primitive for Blockstore/Blobstore
+  - [Fs++](https://github.com/cryfs/fspp): Implement a file system against a platform independent interface