Add notations section

README.md

@@ -47,6 +47,7 @@ If you have a comment or suggestion, please open an [Issue](https://github.com/d
   * [Setup environment](#setup-environment)
   * [Renewing sub-keys](#renewing-sub-keys)
   * [Rotating keys](#rotating-keys-1)
+- [Adding notations](#adding-notations)
 - [SSH](#ssh)
   * [Create configuration](#create-configuration)
   * [Replace agents](#replace-agents)
@@ -1875,6 +1876,30 @@ $ sudo umount /mnt/public
 
 Disconnect the storage device and follow the original steps to transfer new keys (4, 5 and 6) to YubiKey, replacing existing ones. Reboot or securely erase the GPG temporary working directory.
 
+# Adding notations
+
+Notations can be added to users ID(s) and can be used in conjunction with [Keyoxide](https://keyoxide.org) to create [OpenPGP identity proofs](https://keyoxide.org/guides/openpgp-proofs).
+
+The setup environment can be created by using this [section](#setup-environment) from this guide.
+
+After having completed the environment setup, it is possible to follow any of the guides listed under "Adding proofs" from the Keyoxide ["Guides"](https://keyoxide.org/guides/) page __up until the notation is saved using the `save` command`.
+
+At this point the public key can be exported:
+
+```console
+$ gpg --export $KEYID > pubkey.gpg
+```
+
+The public key can now be transferred to the computer where the GPG key is used and it is imported with:
+
+```console
+$ gpg --import pubkey.gpg
+```
+
+N.B.: The `showpref` command can be issued to ensure that the notions were correctly added.
+
+It is now possible to continue following the Keyoxide guide and upload the key to WKD or to keys.openpgp.org.
+
 # SSH
 
 [gpg-agent](https://wiki.archlinux.org/index.php/GnuPG#SSH_agent) supports the OpenSSH ssh-agent protocol (`enable-ssh-support`), as well as Putty's Pageant on Windows (`enable-putty-support`). This means it can be used instead of the traditional ssh-agent / pageant. There are some differences from ssh-agent, notably that gpg-agent does not _cache_ keys rather it converts, encrypts and stores them - persistently - as GPG keys and then makes them available to ssh clients. Any existing ssh private keys that you'd like to keep in `gpg-agent` should be deleted after they've been imported to the GPG agent.