diff --git a/README.md b/README.md
index bec5339..429ffbb 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Solo
 
-This is the source code for Solo.  Solo is a security key that implements FIDO2/U2F and supports USB, NFC, and extensions.  Extensions
-include SSH, GPG, and cryptocurrency.  Solo is a work in progress.
+Solo is an affordable security key that implements FIDO2/U2F and supports USB, NFC, and extensions.  Extensions
+include SSH, GPG, and cryptocurrency.  Solo is an upgrade to [U2F Zero](https://github.com/conorpp/u2f-zero) and is a work in progress.
 
 ![](https://i.imgur.com/cXWtI1D.png)
 ![](https://i.imgur.com/vwFbsQW.png?1)