howto/yubikey.md

@@ -6,6 +6,11 @@ YubiKeys are rugged security keys that can do FIDO2 two-factor
 authentication (2FA), PKCS and OpenPGP operations, all inside a small
 USB form factor.
 
+Note that if you're looking for OpenPGP documentation, you're not
+exactly in the right place. There *are* documentation on using OpenPGP
+*with* a YubiKey here, but if you are an OpenPGP novice, you will want
+to read the [OpenPGP documentation](howto/openpgp) first instead.
+
 [[_TOC_]]
 
 # Tutorial