diff --git a/packages/neutron-sdk/src/bindings/types.rs b/packages/neutron-sdk/src/bindings/types.rs
index 9b70b503..ac432f00 100644
--- a/packages/neutron-sdk/src/bindings/types.rs
+++ b/packages/neutron-sdk/src/bindings/types.rs
@@ -98,43 +98,64 @@ pub struct StorageValue {
 
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq, JsonSchema)]
 #[serde(rename_all = "snake_case")]
+/// Acknowledgement Failure of sudo handler; can be resubmitted.
 pub struct Failure {
-    /// **channel_id** is an id for channel failure
-    pub channel_id: String,
-    // **address** of the failed contract
+    /// **address** of the failed contract
     pub address: String,
-    // **id** of the failure under specific address
+    /// **id** of the failure under specific address
     pub id: u64,
-    /// **sequence_id** is channel sequence id
-    pub sequence_id: u64, // TODO: is renaming ok?; TODO: remove this since we have sequence_id in packet?
     /// **ack_type** is an acknowledgement type ('ack' or 'timeout')
     pub ack_type: String,
     /// **packet** is an IBC Packet that was sent
-    pub packet: Packet,
+    pub packet: Option<Packet>,
     /// **ack** is an acknowledgement data
-    pub ack: Acknowledgement,
+    pub ack: Option<Acknowledgement>,
 }
 
 #[derive(Serialize, Deserialize, Clone, PartialEq, Eq, JsonSchema, Debug)]
 #[serde(rename_all = "snake_case")]
 /// IBC packet
 pub struct Packet {
+    /// **sequence** number of packet in ordered channel
     pub sequence: u64,
+
+    /// **source_port** of packet packet
     pub source_port: String,
+
+    /// **source_channel** of a packet
     pub source_channel: String,
+
+    /// **destination_port** of a packet
     pub destination_port: String,
+
+    /// **destination_channel** of a packet
     pub destination_channel: String,
+
+    /// **data** of a packet
     pub data: Binary,
-    pub timeout_height: Height,
-    pub timeout_timestamp: u64,
+
+    /// **timeout_height** of a packet
+    pub timeout_height: Option<Height>,
+
+    /// **timeout_timestamp** of a packet
+    pub timeout_timestamp: Option<u64>,
 }
 
 #[derive(Serialize, Deserialize, Clone, PartialEq, Eq, JsonSchema, Debug)]
 #[serde(rename_all = "snake_case")]
-/// IBC packet
-/// TODO: do we need our own structure in order for it to pass through neutron
-pub enum Acknowledgement {
+/// IBC message Acknowledgement
+pub struct Acknowledgement {
+    #[serde(rename(serialize = "response", deserialize = "Response"))]
+    pub response: AcknowledgementResponse,
+}
+
+#[derive(Serialize, Deserialize, Clone, PartialEq, Eq, JsonSchema, Debug)]
+#[serde(rename_all = "snake_case")]
+/// IBC message acknowledgement response
+pub enum AcknowledgementResponse {
+    /// Error response
     Error(String),
+    /// Successful response with result as encoded binary
     Result(Binary),
 }