diff --git a/MEV_on_Ethereum/block_builders.md b/MEV_on_Ethereum/block_builders.md
index 93d8dde..eb0f408 100644
--- a/MEV_on_Ethereum/block_builders.md
+++ b/MEV_on_Ethereum/block_builders.md
@@ -1,10 +1,16 @@
 ## block builders
 
+### tl; dr
+
+
+
 <br>
 
+----
 
-### Resources
+### resources
 
+* [flashbots builder](https://github.com/flashbots/builder)
 * [etherscan blocks](https://etherscan.io/blocks), [mev blocks](https://etherscan.io/blocks/label/mev-block), and [mev builders](https://etherscan.io/accounts/label/mev-builder)
 * [builder69.io endpoint for searchers (bundle/tx)](https://builder0x69.io)
-* [flashbots builder](https://github.com/flashbots/builder)
+* [mev-rs - gateway to a network of block builders](https://github.com/ralexstokes/mev-rs)