diff --git a/book/source/02-highlevel.md b/book/source/02-highlevel.md
index 19bb393..9739b0d 100644
--- a/book/source/02-highlevel.md
+++ b/book/source/02-highlevel.md
@@ -96,6 +96,8 @@ Significant support for OpenPGP version 6 has already been achieved for multiple
 - [PGPy](https://github.com/dkg/PGPy/tree/dkg/crypto-refresh),
 - [Sequoia PGP](https://gitlab.com/sequoia-pgp/sequoia/-/tree/crypto-refresh).
 
+Additionally, initial work on support for version 6 has been done for the PGPainless and RNP implementations.
+
 ### Post-quantum cryptography in OpenPGP
 
 There is [ongoing work](https://datatracker.ietf.org/doc/draft-wussler-openpgp-pqc/) to standardize and add support for post-quantum public-key algorithms in OpenPGP. This project is funded by the [german "BSI"](https://en.wikipedia.org/wiki/Federal_Office_for_Information_Security). Goals include adding support for post-quantum cryptography to Thunderbird and GnuPG. A [presentation](https://datatracker.ietf.org/meeting/113/materials/slides-113-openpgp-a-post-quantum-approach-for-openpgp-00) was given at [IETF 113](https://datatracker.ietf.org/meeting/113/session/openpgp/).