diff --git a/core/blockchain.go b/core/blockchain.go
index c6c845350349..a62e085cfc28 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -1266,7 +1266,8 @@ func (bc *BlockChain) writeBlockWithState(block *types.Block, receipts []*types.
 	return nil
 }
 
-// WriteBlockWithState writes the block and all associated state to the database.
+// WriteBlockAndSetHead writes the given block and all associated state to the database,
+// and applies the block as the new chain head.
 func (bc *BlockChain) WriteBlockAndSetHead(block *types.Block, receipts []*types.Receipt, logs []*types.Log, state *state.StateDB, emitHeadEvent bool) (status WriteStatus, err error) {
 	if !bc.chainmu.TryLock() {
 		return NonStatTy, errChainStopped
@@ -1276,9 +1277,8 @@ func (bc *BlockChain) WriteBlockAndSetHead(block *types.Block, receipts []*types
 	return bc.writeBlockAndSetHead(block, receipts, logs, state, emitHeadEvent)
 }
 
-// writeBlockAndSetHead writes the block and all associated state to the database,
-// and also it applies the given block as the new chain head. This function expects
-// the chain mutex to be held.
+// writeBlockAndSetHead is the internal implementation of WriteBlockAndSetHead.
+// This function expects the chain mutex to be held.
 func (bc *BlockChain) writeBlockAndSetHead(block *types.Block, receipts []*types.Receipt, logs []*types.Log, state *state.StateDB, emitHeadEvent bool) (status WriteStatus, err error) {
 	if err := bc.writeBlockWithState(block, receipts, logs, state); err != nil {
 		return NonStatTy, err