release notes

Author: thomash-acinq

docs/release-notes/eclair-vnext.md

@@ -13,6 +13,14 @@ When using anchor outputs, allows propagating our local commitment transaction t
 
 This removes the need for increasing the commitment feerate based on mempool conditions, which ensures that channels won't be force-closed anymore when nodes disagree on the current feerate.
 
+### Attributable failures
+
+Eclair now supports attributable failures which allow nodes to prove they are not the source of the failure and provide timing data.
+Previously a failing node could choose not to report the failure and we would penalize all nodes of the route.
+If all nodes of the route support attributable failures, we only need to penalize two nodes (there is still some uncertainty as to which of the two nodes is the failing one).
+See https://github.com/lightning/bolts/pull/1044 for more details.
+Support is enabled by default, it can be disabled by setting `eclair.features.option_attributable_failure = disbaled`.
+
 ### API changes
 
 - `listoffers` now returns more details about each offer.