# Week 1 Updates This week, I focused more towards looking into the implemenration details for FOCIL in Erigon. To start with I focused first with checking the changes necessary to be introducded in engine api and the execution client. I read into the details for the [EIP-7805](https://eips.ethereum.org/EIPS/eip-7805) and also started looking into the implementation details in other clients. # Specifications * [Consensus spec](https://ethereum.github.io/consensus-specs/specs/_features/eip7805/beacon-chain/) * [Execution spec](https://github.com/ethereum/execution-specs/pull/1214) To start implementing FOCIL in Erigon, I started going through the codebase and added the comments where certain updation related to payload building will be introduced and validations regarding the transaction inclusion to the inclusion lists will be performed. I also started planning out my proposal and specing out the details into it as well. # Next week Todo's I'll continue with finalzing my proposal and the presentation for the ETHCC. I also will slightly touch on writing some code and adding/updating the data structures in the EL client.