Add sample URL

README.md

@@ -22,8 +22,8 @@ just connect to their computer!
 It's a bit geeky, but it works actually rather simple.
 To become a real IPv6 friend, you need to do the following things:
 
-- Generate a GPG key with a comment named RIF following the URL of
-  your computer
+- Generate a GPG key with a comment named **RIF** following the URL of
+  your computer (f.i. **RIF https://nico.ungleich.cloud**)
 - Ensure that the URL points to the IPv6 address of your computer
 - Setup a webserver on your computer
 - Export your key and all real IPv6 friend keys to your webserver as