diff --git a/protocols/matrix.md b/protocols/matrix.md
index ee31546..2b2e3e7 100644
--- a/protocols/matrix.md
+++ b/protocols/matrix.md
@@ -11,3 +11,5 @@ Matrix is governed by [The Matrix.org Foundation CIC](https://matrix.org/foundat
 Matrix has a more flexible identity solution than most decentralised protocols - users have a Matrix user ID, but can also use 3rd party IDs.  A Matrix account can link to ids such as email addresses, social accounts, and phone numbers.  A globally federated cluster of trusted identity servers verify and replicate the mappings, although this is a stopgap solution until a fully decentralised identity solution is adopted.
 
 The Matrix team has also been working intensively on tools for moderation, detailed [here](https://matrix.org/docs/guides/moderation/), and is in the final stages of releasing a [P2P variant of the protocol](https://fosdem.org/2020/schedule/event/dip_p2p_matrix/).
+
+In particular, we may be interested in the [Proposal for Aggregation via Relations](https://github.com/matrix-org/matrix-doc/blob/matthew/msc1849/proposals/1849-aggregations.md)