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+There are multiple specification documents that claim to specify the OpenPGP protocol.
+This page is intended to keep track of the various documents.
+
+## [RFC2440 - OpenPGP Message Format](https://datatracker.ietf.org/doc/rfc2440/)
+This is the old OpenPGP standards specification from 1998. It was obsoleted by RFC4880.
+
+## [RFC4880 - OpenPGP Message Format](https://datatracker.ietf.org/doc/rfc4880/)
+This document from 2007 is the latest published revision of the OpenPGP standard. It introduced OpenPGP v4.
+
+## [RFC5581 -  The Camellia Cipher in OpenPGP](https://datatracker.ietf.org/doc/rfc5581/)
+This document specifies the use of the Camellia Cipher with OpenPGP.
+
+## [RFC6637 - Elliptic Curve Cryptography (ECC) in OpenPGP](https://datatracker.ietf.org/doc/rfc6637/)
+This document describes the use of elliptic curves in RFC4880.
+
+## [draft-koch-eddsa-for-openpgp](https://datatracker.ietf.org/doc/draft-koch-eddsa-for-openpgp/)
+This document describes the use of EdDSA keys with RFC4880.
+
+## [draft-ietf-openpgp-rfc4880bis](https://datatracker.ietf.org/doc/draft-ietf-openpgp-rfc4880bis/)
+This living document describes OpenPGP v5. It was replaced by draft-ietf-openpgp-crypto-refresh.
+
+## [draft-ietf-openpgp-crypto-refresh](https://datatracker.ietf.org/doc/draft-ietf-openpgp-crypto-refresh/)
+This living document introducing OpenPGP v6 is currently being worked on by the IETF OpenPGP working group.
+It will eventually be published as the new version of the OpenPGP standard (perhaps as RFC9760?).
+
+## [draft-koch-openpgp-2015-rfc4880bis](https://datatracker.ietf.org/doc/draft-koch-openpgp-2015-rfc4880bis/)
+This living document describes OpenPGP v5 implemented by GnuPG, which diverged from the IETF standard.
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