say something about CryptOps api and client and build.sh

README.md

@@ -4,7 +4,10 @@ CryptOps-enabled Initrd
 This repository contains files that need to be added or changed in a "vanilla"
 initrd in order to be able to use the
 [CryptOps](https://code.greenhost.net/open/cryptops) toolkit to set up an
-encrypted VPS.
+encrypted VPS. CryptOps is included as a subrepository, to be able to track the
+changes op the API wit the changes of this initrd. Use the `build.sh` script to
+copy the CryptOps api and client binaries to the correct location in the initrd
+before building it.
 
 More information can be found on the [documentation
 website](https://cryptops.com)