diff --git a/ethcore/src/client/client.rs b/ethcore/src/client/client.rs
index 4341e1898..1a88af951 100644
--- a/ethcore/src/client/client.rs
+++ b/ethcore/src/client/client.rs
@@ -350,16 +350,15 @@ impl<V> Client<V> where V: Verifier {
 	}
 }
 
-
-// TODO: need MinerService MinerIoHandler
-
 impl<V> BlockChainClient for Client<V> where V: Verifier {
 
 
+	// TODO [todr] Should be moved to miner crate eventually.
 	fn try_seal(&self, block: ClosedBlock, seal: Vec<Bytes>) -> Result<SealedBlock, ClosedBlock> {
 		block.try_seal(self.engine.deref().deref(), seal)
 	}
 
+	// TODO [todr] Should be moved to miner crate eventually.
 	fn prepare_sealing(&self, author: Address, extra_data: Bytes, transactions: Vec<SignedTransaction>) -> Option<ClosedBlock> {
 		let engine = self.engine.deref().deref();
 		let h = self.chain.best_block_hash();
diff --git a/ethcore/src/client/mod.rs b/ethcore/src/client/mod.rs
index d97f0d8b9..c13cfeee1 100644
--- a/ethcore/src/client/mod.rs
+++ b/ethcore/src/client/mod.rs
@@ -102,9 +102,11 @@ pub trait BlockChainClient : Sync + Send {
 	/// Returns logs matching given filter.
 	fn logs(&self, filter: Filter) -> Vec<LocalizedLogEntry>;
 
+	// TODO [todr] Should be moved to miner crate eventually.
 	/// Returns ClosedBlock prepared for sealing.
 	fn prepare_sealing(&self, author: Address, extra_data: Bytes, transactions: Vec<SignedTransaction>) -> Option<ClosedBlock>;
 
+	// TODO [todr] Should be moved to miner crate eventually.
 	/// Attempts to seal given block. Returns `SealedBlock` on success and the same block in case of error.
 	fn try_seal(&self, block: ClosedBlock, seal: Vec<Bytes>) -> Result<SealedBlock, ClosedBlock>;