diff --git a/README.md b/README.md
index 7c0be78..37ebe88 100644
--- a/README.md
+++ b/README.md
@@ -76,6 +76,13 @@ Where message `type` must be one of:
 - `4`: `Transact`
 - `5`: `RelayTo`
 - `6`: `RelayedFrom`
+- `7`: `HrmpNewChannelOpenRequest`
+- `8`: `HrmpChannelAccepted`
+- `9`: `HrmpChannelClosing`
+- `10`: `HrmpInitOpenChannel`
+- `11`: `HrmpAcceptOpenChannel`
+- `12`: `HrmpCloseChannel`
+- `13`: `Staking`
 
 Within XCM, there is an internal datatype `Order`, which encodes an operation on the holding account. It is defined as:
 
@@ -173,6 +180,62 @@ Kind: *Trusted Indication*.
 
 Errors:
 
+### `Staking`
+
+Send staking related messages. All the messages should be executed sequentially and applied atomically.
+
+- `messages: Vec<StakingMssage>`
+
+Kind: *Meta*.
+
+Errors:
+
+#### `StakingMessage` Types
+
+##### `Bond`
+
+- `value: Compact`: The amount of token to bond.
+
+Kind: *Instruction*.
+
+##### `Unbond`
+
+- `value: Compact`: The amount of token to unbond.
+
+Kind: *Instruction*.
+
+##### `Rebond`
+
+- `value: Compact`: The amount of token to bond.
+
+Kind: *Instruction*.
+
+##### `SetPayee`
+
+- `payee: RewardDestination`: The destination account for payment.
+
+TODO: How are we going to define RewardDestination type??
+
+Kind: *Instruction*.
+
+##### `WithdrawUnbonded`
+
+Kind: *Instruction*.
+
+##### `Nominate`
+
+- `targets: Vec<MultiLocation>`: Declare the desire to nominate `targets`.
+
+Kind: *Instruction*.
+
+##### `Chill`
+
+Kind: *Instruction*.
+
+##### `PayoutStakers`
+
+Kind: *Instruction*.
+
 ## `Order` Types
 
 ### `Null`