diff --git a/src/ckb/channel.rs b/src/ckb/channel.rs
index d5d334cb..bc74bdbd 100644
--- a/src/ckb/channel.rs
+++ b/src/ckb/channel.rs
@@ -908,7 +908,7 @@ where
     type State = ChannelActorState;
     type Arguments = ChannelInitializationParameter;
 
-        async fn pre_start(
+    async fn pre_start(
         &self,
         myself: ActorRef<Self::Msg>,
         args: Self::Arguments,
diff --git a/src/ckb_chain/funding/funding_tx.rs b/src/ckb_chain/funding/funding_tx.rs
index 75aa5121..e9050fed 100644
--- a/src/ckb_chain/funding/funding_tx.rs
+++ b/src/ckb_chain/funding/funding_tx.rs
@@ -1,9 +1,5 @@
-use std::collections::{HashMap, HashSet};
-
 use super::super::FundingError;
 use crate::{ckb::serde_utils::EntityHex, ckb_chain::contracts::get_udt_cell_deps};
-
-use tracing::{debug, warn};
 use anyhow::anyhow;
 use ckb_sdk::{
     constants::SIGHASH_TYPE_HASH,
@@ -28,6 +24,8 @@ use molecule::{
 };
 use serde::Deserialize;
 use serde_with::serde_as;
+use std::collections::{HashMap, HashSet};
+use tracing::{debug, warn};
 
 /// Funding transaction wrapper.
 ///
diff --git a/src/main.rs b/src/main.rs
index e0a06991..a31fc5ac 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -23,6 +23,9 @@ use tracing_subscriber::fmt::format;
 
 #[tokio::main]
 pub async fn main() {
+    // ractor will set "id" for each actor:
+    // https://github.com/slawlor/ractor/blob/67d657e4cdcb8884a9ccc9b758704cbb447ac163/ractor/src/actor/mod.rs#L701
+    // here we map it with the node prefix
     let node_formatter = format::debug_fn(|writer, field, value| {
         if field.name() == "id" {
             write!(