diff --git a/spec/Transaction.md b/spec/Transaction.md
index cf688beec4..f084846eca 100644
--- a/spec/Transaction.md
+++ b/spec/Transaction.md
@@ -22,6 +22,7 @@ enum Action {
     MintAsset { ..., },
     TransferAsset { ..., },
     ChangeAssetScheme { ..., },
+    IncreaseAssetSupply { ..., },
     Pay { ..., },
     SetRegularKey { ..., },
     WrapCCC { ..., },
@@ -43,6 +44,10 @@ This kind of asset needs permission to be transferred.
 A regulated asset is an asset that has an registrar.
 The registrar can change the asset scheme and transfer the asset arbitrarily.
 
+If the `allowed_script_hashes` is specified, this asset can be only locked with
+the lock script hashes in the list. If the list is empty, any lock script hashes
+can be used.
+
 ```rust
 MintAsset {
     network_id: NetworkId,
@@ -50,6 +55,7 @@ MintAsset {
     metadata: String,
     approver: Option<PlatformAddress>,
     registrar: Option<PlatformAddress>,
+    allowed_script_hashes: Vec<H160>,
 
     output: AssetMintOutput,
 
@@ -136,23 +142,42 @@ Only the registrar of the asset can use it.
 ```rust
 ChangeAssetScheme {
     network_id: NetworkId,
-    asset_type: H256,
+    shard_id: ShardId,
+    asset_type: H160,
+    seq: usize,
     metadata: String,
     approver: Option<PlatformAddress>,
     registrar: Option<PlatformAddress>,
+    allowed_script_hashes: Vec<H160>,
 
     approvals: Vec<Signature>,
 }
 ```
 
+## IncreaseAssetSupply
+
+It increases the total supply of the asset.
+Only the registrar of the asset can use it.
+
+```rust
+IncreaseAssetSupply {
+    network_id: NetworkId,
+    shard_id: ShardId,
+    asset_type: H160,
+    seq: usize,
+    output: AssetMintOutput,
+    approvals: Vec<Signature>,
+}
+```
+
 ## Pay
 
-`Pay` sends `value` amount of CCC to the `receiver`.
+`Pay` sends `quantity` amount of CCC to the `receiver`.
 
 ```rust
 Pay {
     receiver: Address,
-    amount: u64,
+    quantity: u64,
 }
 ```
 
@@ -176,7 +201,8 @@ WrapCCC {
     shard_id: ShardId,
     lock_script_hash: H160,
     parameters: Vec<Parameters>,
-    amount: u64,
+    quantity: u64,
+    payer: Address,
 }
 ```
 
@@ -193,13 +219,6 @@ UnwrapCCC {
 }
 ```
 
-```rust
-Custom {
-    handler_id: u64,
-    bytes: Bytes,
-}
-```
-
 ## Store
 
 This is a special kind of transaction that allows a user to upload text onto the blockchain.
@@ -227,3 +246,10 @@ Remove {
 
 `Custom` is a special transaction.
 The types of transactions that may exist depends on the consensus engine.
+
+```rust
+Custom {
+    handler_id: u64,
+    bytes: Bytes,
+}
+```