diff --git a/standards.md b/standards.md
index 238b3cc4f..fd535a950 100644
--- a/standards.md
+++ b/standards.md
@@ -15,6 +15,7 @@ Quota                            | IMAP QUOTA extension ([RFC 2087](https://tool
 Seen status synchronization      | IMAP CONDSTORE extension ([RFC 7162](https://tools.ietf.org/html/rfc7162))
 Authorization                    | OAuth2 ([RFC 6749](https://tools.ietf.org/html/rfc6749))
 End-to-end encryption            | [Autocrypt Level 1](https://autocrypt.org/level1.html), OpenPGP ([RFC 4880](https://tools.ietf.org/html/rfc4880)), Security Multiparts for MIME ([RFC 1847](https://tools.ietf.org/html/rfc1847)) and [“Mixed Up” Encryption repairing](https://tools.ietf.org/id/draft-dkg-openpgp-pgpmime-message-mangling-00.html)
+Header encryption                | [Protected Headers for Cryptographic E-mail](https://datatracker.ietf.org/doc/draft-autocrypt-lamps-protected-headers/)
 Configuration assistance         | [Autoconfigure](https://developer.mozilla.org/en-US/docs/Mozilla/Thunderbird/Autoconfiguration) and [Autodiscover](https://technet.microsoft.com/library/bb124251(v=exchg.150).aspx)
 Messenger functions              | [Chat-over-Email](https://github.com/deltachat/deltachat-core-rust/blob/master/spec.md#chat-mail-specification)
 Detect mailing list              | List-Id ([RFC 2919](https://tools.ietf.org/html/rfc2919)) and Precedence ([RFC 3834](https://tools.ietf.org/html/rfc3834))