Explicitly refer to security considerations from index

docs/index.rst

@@ -35,8 +35,11 @@ to manage their SSH and LUKS encryption keys. The CryptOps framework has been
 designed to be open & extensible, allowing it to support external client
 applications in the future.
 
-Find the code at `<https://code.greenhost.net/open/cryptops>`_ and an example initrd at
-`<https://code.greenhost.net/open/cryptops-initrd>`_
+Please read the :doc:`security considerations <considerations>` to learn
+exactly what CryptOps does and doesn't protect against.
+
+Find the code at `<https://code.greenhost.net/open/cryptops>`_ and an example
+initrd at `<https://code.greenhost.net/open/cryptops-initrd>`_
 
 .. _`Dropbear SSH`: https://matt.ucc.asn.au/dropbear/dropbear.html
 .. _Greenhost: https://greenhost.net