diff --git a/consensus/istanbul/backend.go b/consensus/istanbul/backend.go
index ce52cf2abc..9698f4b969 100644
--- a/consensus/istanbul/backend.go
+++ b/consensus/istanbul/backend.go
@@ -62,8 +62,8 @@ type Backend interface {
 	// LastProposal retrieves latest committed proposal and the address of proposer
 	LastProposal() (Proposal, common.Address)
 
-	// HasPropsal checks if the combination of the given hash and height matches any existing blocks
-	HasPropsal(hash common.Hash, number *big.Int) bool
+	// HasProposal checks if the combination of the given hash and height matches any existing blocks
+	HasProposal(hash common.Hash, number *big.Int) bool
 
 	// GetProposer returns the proposer of the given block height
 	GetProposer(number uint64) common.Address
diff --git a/consensus/istanbul/backend/backend.go b/consensus/istanbul/backend/backend.go
index ce84ca3970..0ddef5b424 100644
--- a/consensus/istanbul/backend/backend.go
+++ b/consensus/istanbul/backend/backend.go
@@ -303,8 +303,8 @@ func (sb *Backend) CheckSignature(data []byte, address common.Address, sig []byt
 	return nil
 }
 
-// HasPropsal implements istanbul.Backend.HashBlock
-func (sb *Backend) HasPropsal(hash common.Hash, number *big.Int) bool {
+// HasProposal implements istanbul.Backend.HashBlock
+func (sb *Backend) HasProposal(hash common.Hash, number *big.Int) bool {
 	return sb.chain.GetHeader(hash, number.Uint64()) != nil
 }
 
diff --git a/consensus/istanbul/ibft/core/preprepare.go b/consensus/istanbul/ibft/core/preprepare.go
index 487c5abf59..36d92c1c68 100644
--- a/consensus/istanbul/ibft/core/preprepare.go
+++ b/consensus/istanbul/ibft/core/preprepare.go
@@ -66,7 +66,7 @@ func (c *core) handlePreprepare(msg *ibfttypes.Message, src istanbul.Validator)
 			// Broadcast COMMIT if it is an existing block
 			// 1. The proposer needs to be a proposer matches the given (Sequence + Round)
 			// 2. The given block must exist
-			if valSet.IsProposer(src.Address()) && c.backend.HasPropsal(preprepare.Proposal.Hash(), preprepare.Proposal.Number()) {
+			if valSet.IsProposer(src.Address()) && c.backend.HasProposal(preprepare.Proposal.Hash(), preprepare.Proposal.Number()) {
 				c.sendCommitForOldBlock(preprepare.View, preprepare.Proposal.Hash())
 				return nil
 			}
diff --git a/consensus/istanbul/ibft/core/testbackend_test.go b/consensus/istanbul/ibft/core/testbackend_test.go
index d78984c1e4..a7389022e3 100644
--- a/consensus/istanbul/ibft/core/testbackend_test.go
+++ b/consensus/istanbul/ibft/core/testbackend_test.go
@@ -153,7 +153,7 @@ func (self *testSystemBackend) LastProposal() (istanbul.Proposal, common.Address
 }
 
 // Only block height 5 will return true
-func (self *testSystemBackend) HasPropsal(hash common.Hash, number *big.Int) bool {
+func (self *testSystemBackend) HasProposal(hash common.Hash, number *big.Int) bool {
 	return number.Cmp(big.NewInt(5)) == 0
 }
 
diff --git a/core/types/block.go b/core/types/block.go
index d613cfc57e..5e5f819cbb 100644
--- a/core/types/block.go
+++ b/core/types/block.go
@@ -312,7 +312,7 @@ func (b *Block) Header() *Header { return CopyHeader(b.header) }
 func (b *Block) Body() *Body { return &Body{b.transactions, b.uncles} }
 
 // Size returns the true RLP encoded storage size of the block, either by encoding
-// and returning it, or returning a previsouly cached value.
+// and returning it, or returning a previously cached value.
 func (b *Block) Size() common.StorageSize {
 	if size := b.size.Load(); size != nil {
 		return size.(common.StorageSize)