diff --git a/consensus/consensus.go b/consensus/consensus.go
index bc37d5e9d..bfea5de2a 100644
--- a/consensus/consensus.go
+++ b/consensus/consensus.go
@@ -299,6 +299,7 @@ func (consensus *Consensus) UpdatePublicKeys(pubKeys []kyber.Point) int {
 	return len(consensus.PublicKeys)
 }
 
+// NewFaker returns a faker consensus.
 func NewFaker() *Consensus {
 	return &Consensus{}
 }
@@ -386,11 +387,14 @@ func (consensus *Consensus) SealHash(header *types.Header) (hash common.Hash) {
 	return hash
 }
 
+// Seal is to seal final block.
 func (consensus *Consensus) Seal(chain ChainReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) error {
 	// TODO: implement final block sealing
 	return nil
 }
 
+// Prepare is to prepare ...
+// TODO(RJ): fix it.
 func (consensus *Consensus) Prepare(chain ChainReader, header *types.Header) error {
 	// TODO: implement prepare method
 	return nil
diff --git a/node/worker/worker.go b/node/worker/worker.go
index f4dbc14b2..c8825c186 100644
--- a/node/worker/worker.go
+++ b/node/worker/worker.go
@@ -1,10 +1,11 @@
 package worker
 
 import (
-	"github.com/harmony-one/harmony/log"
 	"math/big"
 	"time"
 
+	"github.com/harmony-one/harmony/log"
+
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/harmony-one/harmony/consensus"
@@ -38,6 +39,7 @@ type Worker struct {
 	gasCeil  uint64
 }
 
+// SelectTransactionsForNewBlock selects transactions for new block.
 func (w *Worker) SelectTransactionsForNewBlock(txs types.Transactions, maxNumTxs int) (types.Transactions, types.Transactions, types.Transactions) {
 	if w.current.gasPool == nil {
 		w.current.gasPool = new(core.GasPool).AddGas(w.current.header.GasLimit)