diff --git a/eth/api.go b/eth/api.go
index d342bfb0b3..12448a6a11 100644
--- a/eth/api.go
+++ b/eth/api.go
@@ -640,67 +640,67 @@ func storageRangeAt(st state.Trie, start []byte, maxResult int) StorageRangeResu
 // GetModifiedAccountsByumber returns all accounts that have changed between the
 // two blocks specified. A change is defined as a difference in nonce, balance,
 // code hash, or storage hash.
+//
 // With one parameter, returns the list of accounts modified in the specified block.
 func (api *PrivateDebugAPI) GetModifiedAccountsByNumber(startNum uint64, endNum *uint64) ([]common.Address, error) {
 	var startBlock, endBlock *types.Block
 
 	startBlock = api.eth.blockchain.GetBlockByNumber(startNum)
 	if startBlock == nil {
-		return nil, fmt.Errorf("Start block %x not found", startNum)
+		return nil, fmt.Errorf("start block %x not found", startNum)
 	}
 
 	if endNum == nil {
 		endBlock = startBlock
 		startBlock = api.eth.blockchain.GetBlockByHash(startBlock.ParentHash())
 		if startBlock == nil {
-			return nil, fmt.Errorf("Block %x has no parent", endBlock.Number())
+			return nil, fmt.Errorf("block %x has no parent", endBlock.Number())
 		}
 	} else {
 		endBlock = api.eth.blockchain.GetBlockByNumber(*endNum)
 		if endBlock == nil {
-			return nil, fmt.Errorf("End block %d not found", *endNum)
+			return nil, fmt.Errorf("end block %d not found", *endNum)
 		}
 	}
-
 	return api.getModifiedAccounts(startBlock, endBlock)
 }
 
 // GetModifiedAccountsByHash returns all accounts that have changed between the
 // two blocks specified. A change is defined as a difference in nonce, balance,
 // code hash, or storage hash.
+//
+// With one parameter, returns the list of accounts modified in the specified block.
 func (api *PrivateDebugAPI) GetModifiedAccountsByHash(startHash common.Hash, endHash *common.Hash) ([]common.Address, error) {
 	var startBlock, endBlock *types.Block
 	startBlock = api.eth.blockchain.GetBlockByHash(startHash)
 	if startBlock == nil {
-		return nil, fmt.Errorf("Start block %x not found", startHash)
+		return nil, fmt.Errorf("start block %x not found", startHash)
 	}
 
 	if endHash == nil {
 		endBlock = startBlock
 		startBlock = api.eth.blockchain.GetBlockByHash(startBlock.ParentHash())
 		if startBlock == nil {
-			return nil, fmt.Errorf("Block %x has no parent", endBlock.Number())
+			return nil, fmt.Errorf("block %x has no parent", endBlock.Number())
 		}
 	} else {
 		endBlock = api.eth.blockchain.GetBlockByHash(*endHash)
 		if endBlock == nil {
-			return nil, fmt.Errorf("End block %x not found", *endHash)
+			return nil, fmt.Errorf("end block %x not found", *endHash)
 		}
 	}
-
 	return api.getModifiedAccounts(startBlock, endBlock)
 }
 
 func (api *PrivateDebugAPI) getModifiedAccounts(startBlock, endBlock *types.Block) ([]common.Address, error) {
 	if startBlock.Number().Uint64() >= endBlock.Number().Uint64() {
-		return nil, fmt.Errorf("Start block height (%d) must be less than end block height (%d)", startBlock.Number().Uint64(), endBlock.Number().Uint64())
+		return nil, fmt.Errorf("start block height (%d) must be less than end block height (%d)", startBlock.Number().Uint64(), endBlock.Number().Uint64())
 	}
 
 	oldTrie, err := trie.NewSecure(startBlock.Root(), api.eth.chainDb, 0)
 	if err != nil {
 		return nil, err
 	}
-
 	newTrie, err := trie.NewSecure(endBlock.Root(), api.eth.chainDb, 0)
 	if err != nil {
 		return nil, err
@@ -708,11 +708,12 @@ func (api *PrivateDebugAPI) getModifiedAccounts(startBlock, endBlock *types.Bloc
 
 	diff, _ := trie.NewDifferenceIterator(oldTrie.NodeIterator([]byte{}), newTrie.NodeIterator([]byte{}))
 	iter := trie.NewIterator(diff)
+
 	var dirty []common.Address
 	for iter.Next() {
 		key := newTrie.GetKey(iter.Key)
-		if(key == nil) {
-			return nil, fmt.Errorf("No preimage found for hash %x", iter.Key)
+		if key == nil {
+			return nil, fmt.Errorf("no preimage found for hash %x", iter.Key)
 		}
 		dirty = append(dirty, common.BytesToAddress(key))
 	}