diff --git a/NODES_on_Ethereum/relays.md b/NODES_on_Ethereum/relays.md
index d524846..457582d 100644
--- a/NODES_on_Ethereum/relays.md
+++ b/NODES_on_Ethereum/relays.md
@@ -16,3 +16,11 @@
 * [blocknative](https://docs.blocknative.com/mev-relay-instructions-for-ethereum-validators)
 * [bloXroute MEV relay](https://bloxroute.max-profit.blxrbdn.com/)
 * [eden](https://relay.edennetwork.io/info)
+
+
+<br>
+
+### on building a relay
+
+* [mev-boost relay](https://github.com/flashbots/mev-boost-relay)
+* [lido call for relays](https://research.lido.fi/t/lido-on-ethereum-call-for-relay-providers/2844/10)