diff --git a/consensus/posv/posv.go b/consensus/posv/posv.go
index 303568fcc6..3f63137c36 100644
--- a/consensus/posv/posv.go
+++ b/consensus/posv/posv.go
@@ -215,10 +215,10 @@ type Posv struct {
 	signFn clique.SignerFn // Signer function to authorize hashes with
 	lock   sync.RWMutex    // Protects the signer fields
 
-	HookReward       func(chain consensus.ChainReader, state *state.StateDB, header *types.Header) error
-	HookPenalty      func(chain consensus.ChainReader, blockNumberEpoc uint64) ([]common.Address, error)
-	HookPrepare      func(header *types.Header, signers []common.Address) error
-	VerifyValidators func(header *types.Header, signers []common.Address) error
+	HookReward    func(chain consensus.ChainReader, state *state.StateDB, header *types.Header) error
+	HookPenalty   func(chain consensus.ChainReader, blockNumberEpoc uint64) ([]common.Address, error)
+	HookValidator func(header *types.Header, signers []common.Address) error
+	HookVerifyMNs func(header *types.Header, signers []common.Address) error
 }
 
 // New creates a Posv proof-of-stake-voting consensus engine with the initial
@@ -394,8 +394,8 @@ func (c *Posv) verifyCascadingFields(chain consensus.ChainReader, header *types.
 		if !bytes.Equal(header.Extra[extraVanity:extraSuffix], byteMasterNodes) {
 			return errInvalidCheckpointSigners
 		}
-		if c.VerifyValidators != nil {
-			err := c.VerifyValidators(header, signers)
+		if c.HookVerifyMNs != nil {
+			err := c.HookVerifyMNs(header, signers)
 			if err != nil {
 				return err
 			}
@@ -705,8 +705,8 @@ func (c *Posv) Prepare(chain consensus.ChainReader, header *types.Header) error
 	if header.Time.Int64() < time.Now().Unix() {
 		header.Time = big.NewInt(time.Now().Unix())
 	}
-	if c.HookPrepare != nil {
-		c.HookPrepare(header, signers)
+	if c.HookValidator != nil {
+		c.HookValidator(header, signers)
 		if err != nil {
 			return err
 		}
diff --git a/eth/backend.go b/eth/backend.go
index f0ed406c0f..be7e7275df 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -190,7 +190,7 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 	if eth.chainConfig.Posv != nil {
 		c := eth.engine.(*posv.Posv)
 
-		// Inject hook for send tx sign to smartcontract after insert block into chain.
+		// Hook sends tx sign to smartcontract after inserting block to chain.
 		importedHook := func(block *types.Block) {
 			snap, err := c.GetSnapshot(eth.blockchain, block.Header())
 			if err != nil {
@@ -210,8 +210,8 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 		}
 		eth.protocolManager.fetcher.SetImportedHook(importedHook)
 
-		// Hook will process when preparing block.
-		c.HookPrepare = func(header *types.Header, signers []common.Address) error {
+		// Hook prepares validators M2 for the current epoch
+		c.HookValidator = func(header *types.Header, signers []common.Address) error {
 			number := header.Number.Int64()
 			if number > 0 && number%common.EpocBlockRandomize == 0 {
 				validators, err := GetValidators(eth.blockchain, signers)
@@ -222,7 +222,8 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 			}
 			return nil
 		}
-		// Hook penalty.
+
+		// Hook scans for bad masternodes and decide to penalty them
 		c.HookPenalty = func(chain consensus.ChainReader, blockNumberEpoc uint64) ([]common.Address, error) {
 			client, err := eth.blockchain.GetClient()
 			if err != nil {
@@ -263,7 +264,7 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 			return []common.Address{}, nil
 		}
 
-		// Hook reward for posv validator.
+		// Hook calculates reward for masternodes
 		c.HookReward = func(chain consensus.ChainReader, state *state.StateDB, header *types.Header) error {
 			client, err := eth.blockchain.GetClient()
 			if err != nil {
@@ -308,7 +309,9 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 
 			return nil
 		}
-		c.VerifyValidators = func(header *types.Header, signers []common.Address) error {
+
+		// Hook verifies masternodes set
+		c.HookVerifyMNs = func(header *types.Header, signers []common.Address) error {
 			number := header.Number.Int64()
 			if number > 0 && number%common.EpocBlockRandomize == 0 {
 				validators, err := GetValidators(eth.blockchain, signers)