diff --git a/chat-signaling-server/src/signaling/redisexchange.rs b/chat-signaling-server/src/signaling/redisexchange.rs
index b511c91..64699ae 100644
--- a/chat-signaling-server/src/signaling/redisexchange.rs
+++ b/chat-signaling-server/src/signaling/redisexchange.rs
@@ -69,7 +69,7 @@ pub async fn send_message_to_peers(
         let room: String = message.room;
 
         match inner_message {
-            signaling::signaling_message::Message::Bootstrap(()) => {
+            signaling::signaling_message::Message::Bootstrap(()) => { // client may need a name, bootstrap all the information here.
                 if message.sender != "" {
                     name = message.sender.to_string();
                 } else {
@@ -85,7 +85,7 @@ pub async fn send_message_to_peers(
                     closing_rx.clone(),
                 ));
             }
-            signaling::signaling_message::Message::DiscoverRequest(()) => {
+            signaling::signaling_message::Message::DiscoverRequest(()) => { // client broadcast discover to room
                 let peers: usize = match redis
                     .publish(format!("chatchat:{room}:discover"), name.clone())
                     .await
@@ -98,7 +98,7 @@ pub async fn send_message_to_peers(
                 };
                 tracing::info!(peers, room, sender = name, "broadcasting discover");
             }
-            signaling::signaling_message::Message::DiscoverResponse(()) => {
+            signaling::signaling_message::Message::DiscoverResponse(()) => { // client received broadcast from others. responde to it: please connect to me. also it should prepare peer connection before send this message.
                 let receiver = message.receiver.unwrap();
                 let peers: usize = match redis
                     .publish(format!("chatchat:{room}:discover:{receiver}"), name.clone())
@@ -112,7 +112,7 @@ pub async fn send_message_to_peers(
                 };
                 tracing::info!(peers, room, sender = name, receiver, "reply to discover");
             }
-            signaling::signaling_message::Message::SessionOffer(sdp) => {
+            signaling::signaling_message::Message::SessionOffer(sdp) => { // client received conenct to me message. creating offer.
                 let msg = serde_json::to_string(&sdp).unwrap();
                 let receiver = message.receiver.unwrap();
                 let peers: usize = match redis
@@ -128,7 +128,7 @@ pub async fn send_message_to_peers(
 
                 tracing::info!(peers, room, sender = name, receiver, "offering")
             }
-            signaling::signaling_message::Message::SessionAnswer(sdp) => {
+            signaling::signaling_message::Message::SessionAnswer(sdp) => { // answer to offer
                 let msg = serde_json::to_string(&sdp).unwrap();
                 let receiver = message.receiver.unwrap();
                 let peers: usize = match redis
@@ -143,7 +143,7 @@ pub async fn send_message_to_peers(
                 };
                 tracing::info!(peers, room, sender = name, receiver, "answering")
             }
-            signaling::signaling_message::Message::IceCandidate(candidate) => {
+            signaling::signaling_message::Message::IceCandidate(candidate) => { // trickle ice
                 let msg = serde_json::to_string(&candidate).unwrap();
                 let receiver = message.receiver.unwrap();
                 let peers: usize = match redis