diff --git a/specification.md b/specification.md
index 2b0179f15..25b9d7d0e 100644
--- a/specification.md
+++ b/specification.md
@@ -269,7 +269,7 @@ See below for more details on the message types and how they are used.
     - `TotalTxs (int64)`: Total number of transactions in the blockchain until
       now
     - `LastBlockHash ([]byte)`: Hash of the previous (parent) block
-    - `ValSetHash ([]byte)`: Hash of the validator set for this block
+    - `ValidatorsHash ([]byte)`: Hash of the validator set for this block
     - `AppHash ([]byte)`: Data returned by the last call to `Commit` - typically the
       Merkle root of the application state after executing the previous block's
       transactions
diff --git a/types/types.pb.go b/types/types.pb.go
index 72de6b53c..a6b806fe6 100644
--- a/types/types.pb.go
+++ b/types/types.pb.go
@@ -1688,9 +1688,9 @@ type Header struct {
 	NumTxs   int32 `protobuf:"varint,4,opt,name=num_txs,json=numTxs,proto3" json:"num_txs,omitempty"`
 	TotalTxs int64 `protobuf:"varint,5,opt,name=total_txs,json=totalTxs,proto3" json:"total_txs,omitempty"`
 	// hashes
-	LastBlockHash []byte `protobuf:"bytes,6,opt,name=last_block_hash,json=lastBlockHash,proto3" json:"last_block_hash,omitempty"`
-	ValSetHash    []byte `protobuf:"bytes,7,opt,name=val_set_hash,json=valSetHash,proto3" json:"val_set_hash,omitempty"`
-	AppHash       []byte `protobuf:"bytes,8,opt,name=app_hash,json=appHash,proto3" json:"app_hash,omitempty"`
+	LastBlockHash  []byte `protobuf:"bytes,6,opt,name=last_block_hash,json=lastBlockHash,proto3" json:"last_block_hash,omitempty"`
+	ValidatorsHash []byte `protobuf:"bytes,7,opt,name=validators_hash,json=validatorsHash,proto3" json:"validators_hash,omitempty"`
+	AppHash        []byte `protobuf:"bytes,8,opt,name=app_hash,json=appHash,proto3" json:"app_hash,omitempty"`
 	// consensus
 	Proposer Validator `protobuf:"bytes,9,opt,name=proposer" json:"proposer"`
 }
@@ -1742,9 +1742,9 @@ func (m *Header) GetLastBlockHash() []byte {
 	return nil
 }
 
-func (m *Header) GetValSetHash() []byte {
+func (m *Header) GetValidatorsHash() []byte {
 	if m != nil {
-		return m.ValSetHash
+		return m.ValidatorsHash
 	}
 	return nil
 }
@@ -2335,121 +2335,121 @@ var _ABCIApplication_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("types/types.proto", fileDescriptorTypes) }
 
 var fileDescriptorTypes = []byte{
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+	0xfa, 0xf3, 0x98, 0x64, 0x07, 0xd0, 0x0a, 0x97, 0xe3, 0x11, 0xd6, 0xa6, 0x7c, 0x60, 0x9e, 0x2f,
+	0xc7, 0x5f, 0x8a, 0xab, 0x78, 0x42, 0x09, 0x89, 0xa2, 0xea, 0x14, 0x7c, 0x23, 0x22, 0xe3, 0x3f,
+	0x4d, 0xd8, 0x0a, 0xba, 0xc5, 0xf1, 0x84, 0x7d, 0x0c, 0x56, 0x62, 0x5f, 0x21, 0x41, 0x8a, 0x77,
+	0x4e, 0x05, 0xb1, 0x85, 0x91, 0xde, 0xd4, 0x17, 0xee, 0x28, 0xf5, 0x2d, 0xdd, 0xab, 0xed, 0x74,
+	0x34, 0xe3, 0xe7, 0xb1, 0x73, 0xed, 0x1f, 0x42, 0x53, 0xdf, 0x91, 0x7e, 0xd4, 0xab, 0x30, 0xee,
+	0xaf, 0x68, 0x5d, 0x9a, 0xc9, 0x7f, 0xaa, 0x40, 0x3b, 0x1e, 0x7f, 0x4a, 0x95, 0x72, 0x97, 0xae,
+	0xbe, 0xed, 0xa5, 0xd7, 0xcd, 0x8e, 0x71, 0xac, 0xd5, 0x33, 0xb1, 0x76, 0x00, 0x4c, 0x87, 0xd4,
+	0x65, 0xa0, 0x3c, 0x7f, 0x3a, 0xd2, 0xde, 0xd4, 0xb1, 0xd5, 0x25, 0xce, 0x0b, 0x62, 0x9c, 0xe3,
+	0xfe, 0xd1, 0xb7, 0x0d, 0xe8, 0x1c, 0x9f, 0x9c, 0x9e, 0x1d, 0x87, 0xe1, 0xdc, 0x9b, 0x70, 0xea,
+	0xba, 0x06, 0x50, 0xa7, 0xbe, 0xb2, 0xe4, 0x75, 0xaa, 0x5f, 0x36, 0xe0, 0xb0, 0x23, 0x68, 0x50,
+	0x7b, 0xc9, 0xca, 0x1e, 0xa9, 0xfa, 0xa5, 0x73, 0x0e, 0x7e, 0x44, 0x37, 0xa0, 0xd7, 0xdf, 0xaa,
+	0xfa, 0x65, 0xc3, 0x0e, 0xfb, 0x0c, 0xac, 0xb4, 0x31, 0x5c, 0xf7, 0x62, 0xd5, 0x5f, 0x3b, 0xf6,
+	0xa0, 0x7e, 0x5a, 0x6b, 0xd7, 0xbd, 0xef, 0xf4, 0xd7, 0xce, 0x07, 0xec, 0x31, 0xb4, 0xe2, 0x6e,
+	0xa5, 0xfc, 0x4d, 0xa9, 0xbf, 0x66, 0x24, 0x41, 0xf7, 0xe8, 0x8e, 0xaf, 0xec, 0xe1, 0xab, 0x5f,
+	0x3a, 0x37, 0xb1, 0x87, 0xd0, 0x34, 0x05, 0xa3, 0xf4, 0x75, 0xa8, 0x5f, 0x3e, 0x58, 0xa0, 0x91,
+	0x69, 0xb7, 0xbb, 0xee, 0x71, 0xae, 0xbf, 0x76, 0xc0, 0x63, 0xc7, 0x00, 0x99, 0x2e, 0x6f, 0xed,
+	0xab, 0x5b, 0x7f, 0xfd, 0xe0, 0xc6, 0x3e, 0x85, 0x76, 0x3a, 0x8c, 0x97, 0xbf, 0x86, 0xf5, 0xd7,
+	0xcd, 0x52, 0xe3, 0x26, 0xbd, 0x98, 0x7e, 0xf4, 0xdf, 0x00, 0x00, 0x00, 0xff, 0xff, 0xe5, 0xf3,
+	0xb2, 0x34, 0xad, 0x15, 0x00, 0x00,
 }
diff --git a/types/types.proto b/types/types.proto
index a1c553751..b4f4b2aa6 100644
--- a/types/types.proto
+++ b/types/types.proto
@@ -231,7 +231,7 @@ message Header {
 
   // hashes
   bytes last_block_hash = 6;
-  bytes val_set_hash = 7;
+  bytes validators_hash = 7;
   bytes app_hash = 8;
 
   // consensus