diff --git a/.gitignore b/.gitignore
index 0c585e1d..3a29e8a4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 build/
 .kdev4/
+.vscode/
 *.user
 *-swp
 *.kdev4
diff --git a/README.md b/README.md
new file mode 100644
index 00000000..e0138286
--- /dev/null
+++ b/README.md
@@ -0,0 +1,7 @@
+# FreeKill
+
+___
+
+试图打造一个最适合diy玩家游玩的民间三国杀，所有的一切都是为了更好的制作diy而设计的。
+
+项目仍处于啥都没有的阶段。不过我为了整理思路，也写了点[文档](./doc/index.md)。
diff --git a/doc/dev/index.md b/doc/dev/index.md
new file mode 100644
index 00000000..80a8cd84
--- /dev/null
+++ b/doc/dev/index.md
@@ -0,0 +1,9 @@
+# FreeKill 开发文档
+
+> dev
+
+___
+
+FreeKill采用Qt框架提供底层支持，在上层使用lua语言开发。在UI方面使用的是Qt Quick。
+
+- [通信](./protocol.md)
diff --git a/doc/dev/protocol.md b/doc/dev/protocol.md
new file mode 100644
index 00000000..5822be6e
--- /dev/null
+++ b/doc/dev/protocol.md
@@ -0,0 +1,36 @@
+# FreeKill 的通信
+
+> [dev](./index.md) > 通信
+
+___
+
+## 概述
+
+FreeKill使用UTF-8文本进行通信。基本的通信格式为JSON数组：
+
+`[requestId, packetType, command, jsonData]`
+
+其中：
+
+- requestId用来在request型通信使用，用来确保收到的回复和发出的请求相对应。
+- packetType用来确定这条消息的类型以及发送的目的地。
+- command用来表示消息的类型。使用首字母大写的驼峰式命名，因为下划线命名会造成额外的网络开销。
+- jsonData保存着这个消息的额外信息，必须是一个JSON数组。数组中的具体内容详见源码及注释。
+
+FreeKill通信有三大类型：请求（Request）、回复（Reply）和通知（Notification）。
+
+___
+
+## 从连接上到进入大厅
+
+想要启动服务器，需要通过命令行终端：
+
+```sh
+$ ./FreeKill -s <port>
+```
+
+`<port>`是服务器运行的端口号，如果不带任何参数则启动GUI界面，在GUI界面里面只能加入服务器或者单机游戏。
+
+服务器以TCP方式监听。在默认情况下（比如单机启动），服务器的端口号是9527。
+
+每当任何一个客户端连接上了之后，客户端进入大厅。
\ No newline at end of file
diff --git a/doc/diy/index.md b/doc/diy/index.md
new file mode 100644
index 00000000..ecb2c1a1
--- /dev/null
+++ b/doc/diy/index.md
@@ -0,0 +1,5 @@
+# 如何用FreeKill实现diy武将
+
+> diy
+
+___
diff --git a/doc/index.md b/doc/index.md
new file mode 100644
index 00000000..50906e52
--- /dev/null
+++ b/doc/index.md
@@ -0,0 +1,6 @@
+# FreeKill 文档
+
+___
+
+- [开发者文档](./dev/index.md)
+- [DIY玩家文档](./diy/index.md)
diff --git a/lua/client/client.lua b/lua/client/client.lua
index d46ac0d4..3d335877 100644
--- a/lua/client/client.lua
+++ b/lua/client/client.lua
@@ -4,15 +4,15 @@ freekill.client_callback = {}
 
 function Client:initialize()
     self.client = freekill.ClientInstance
-    self.notifyUI = function(self, command, json_data)
-        freekill.Backend:emitNotifyUI(command, json_data)
+    self.notifyUI = function(self, command, jsonData)
+        freekill.Backend:emitNotifyUI(command, jsonData)
     end
-    self.client.callback = function(_self, command, json_data)
+    self.client.callback = function(_self, command, jsonData)
         local cb = freekill.client_callback[command]
         if (type(cb) == "function") then
-            cb(json_data)
+            cb(jsonData)
         else
-            self:notifyUI(command, json_data);
+            self:notifyUI(command, jsonData);
         end
     end
 end
diff --git a/lua/server/server.lua b/lua/server/server.lua
index 5ea55f11..dcf3d789 100644
--- a/lua/server/server.lua
+++ b/lua/server/server.lua
@@ -4,36 +4,36 @@ freekill.server_callback = {}
 
 function Server:initialize()
     self.server = freekill.ServerInstance
-    self.server.callback = function(_self, command, json_data)
+    self.server.callback = function(_self, command, jsonData)
         local cb = freekill.server_callback[command]
         if (type(cb) == "function") then
-            cb(json_data)
+            cb(jsonData)
         else
             print("Server error: Unknown command " .. command);
         end
     end
 end
 
-freekill.server_callback["create_room"] = function(json_data)
-    -- json_data: [ int uid, string name, int capacity ]
-    local data = json.decode(json_data)
+freekill.server_callback["CreateRoom"] = function(jsonData)
+    -- jsonData: [ int uid, string name, int capacity ]
+    local data = json.decode(jsonData)
     local owner = freekill.ServerInstance:findPlayer(tonumber(data[1]))
     local roomName = data[2]
     local capacity = data[3]
     freekill.ServerInstance:createRoom(owner, roomName, capacity)
 end
 
-freekill.server_callback["enter_room"] = function(json_data)
-    -- json_data: [ int uid, int roomId ]
-    local data = json.decode(json_data)
+freekill.server_callback["EnterRoom"] = function(jsonData)
+    -- jsonData: [ int uid, int roomId ]
+    local data = json.decode(jsonData)
     local player = freekill.ServerInstance:findPlayer(tonumber(data[1]))
     local room = freekill.ServerInstance:findRoom(tonumber(data[2]))
     room:addPlayer(player)
 end
 
-freekill.server_callback["quit_room"] = function(json_data)
-    -- json_data: [ int uid ]
-    local data = json.decode(json_data)
+freekill.server_callback["QuitRoom"] = function(jsonData)
+    -- jsonData: [ int uid ]
+    local data = json.decode(jsonData)
     local player = freekill.ServerInstance:findPlayer(tonumber(data[1]))
     local room = player:getRoom()
     if not room:isLobby() then
diff --git a/qml/Pages/CreateRoom.qml b/qml/Pages/CreateRoom.qml
index fe7b0397..e404307b 100644
--- a/qml/Pages/CreateRoom.qml
+++ b/qml/Pages/CreateRoom.qml
@@ -46,7 +46,7 @@ Item {
                         mainWindow.busy = true;
                         mainStack.pop();
                         Backend.notifyServer(
-                            "create_room",
+                            "CreateRoom",
                             JSON.stringify([roomName.text, playerNum.value])
                         );
                     }
diff --git a/qml/Pages/Room.qml b/qml/Pages/Room.qml
index 0c969600..e40d29e0 100644
--- a/qml/Pages/Room.qml
+++ b/qml/Pages/Room.qml
@@ -11,7 +11,7 @@ Item {
         text: "quit"
         onClicked: {
             mainStack.pop();
-            Backend.notifyServer("quit_room", "[]");
+            Backend.notifyServer("QuitRoom", "[]");
         }
     }
 }
diff --git a/qml/main.qml b/qml/main.qml
index 7e971460..d3dbb7d1 100644
--- a/qml/main.qml
+++ b/qml/main.qml
@@ -9,25 +9,31 @@ Window {
     width: 720
     height: 480
     property var callbacks: ({
-        "error_msg": function(json_data) {
-            toast.show(json_data);
+        "ErrorMsg": function(jsonData) {
+            toast.show(jsonData);
             mainWindow.busy = false;
         },
-        "enter_lobby": function(json_data) {
+        "EnterLobby": function(jsonData) {
             if (mainStack.depth === 1) {
                 mainStack.push(lobby);
             }
             mainWindow.busy = false;
         },
-        "enter_room": function(json_data) {
+        "EnterRoom": function(jsonData) {
             mainStack.push(room);
             mainWindow.busy = false;
         },
-        "update_room_list": function(json_data) {
+        "UpdateRoomList": function(jsonData) {
             let current = mainStack.currentItem;    // should be lobby
             current.roomModel.clear();
-            JSON.parse(json_data).forEach(function(room) {
-                current.roomModel.append(room);
+            JSON.parse(jsonData).forEach(function(room) {
+                current.roomModel.append({
+                    roomId: room[0],
+                    roomName: room[1],
+                    gameMode: room[2],
+                    playerNum: room[3],
+                    capacity: room[4],
+                });
             });
         }
     })
@@ -110,12 +116,12 @@ Window {
 
     Connections {
         target: Backend
-        function onNotifyUI(command, json_data) {
+        function onNotifyUI(command, jsonData) {
             let cb = callbacks[command]
             if (typeof(cb) === "function") {
-                cb(json_data);
+                cb(jsonData);
             } else {
-                callbacks["error_msg"]("Unknown command " + command + "!");
+                callbacks["ErrorMsg"]("Unknown command " + command + "!");
             }
         }
     }
diff --git a/src/client/client.cpp b/src/client/client.cpp
index dd27cf68..07c47aca 100644
--- a/src/client/client.cpp
+++ b/src/client/client.cpp
@@ -32,20 +32,20 @@ void Client::connectToHost(const QHostAddress& server, ushort port)
     router->getSocket()->connectToHost(server, port);
 }
 
-void Client::requestServer(const QString& command, const QString& json_data, int timeout)
+void Client::requestServer(const QString& command, const QString& jsonData, int timeout)
 {
     int type = Router::TYPE_REQUEST | Router::SRC_CLIENT | Router::DEST_SERVER;
-    router->request(type, command, json_data, timeout);
+    router->request(type, command, jsonData, timeout);
 }
 
-void Client::replyToServer(const QString& command, const QString& json_data)
+void Client::replyToServer(const QString& command, const QString& jsonData)
 {
     int type = Router::TYPE_REPLY | Router::SRC_CLIENT | Router::DEST_SERVER;
-    router->reply(type, command, json_data);
+    router->reply(type, command, jsonData);
 }
 
-void Client::notifyServer(const QString& command, const QString& json_data)
+void Client::notifyServer(const QString& command, const QString& jsonData)
 {
     int type = Router::TYPE_NOTIFICATION | Router::SRC_CLIENT | Router::DEST_SERVER;
-    router->notify(type, command, json_data);
+    router->notify(type, command, jsonData);
 }
diff --git a/src/client/client.h b/src/client/client.h
index 8bd31bac..1f25d217 100644
--- a/src/client/client.h
+++ b/src/client/client.h
@@ -20,11 +20,11 @@ public:
     // void login
 
     void requestServer(const QString &command,
-                   const QString &json_data, int timeout = -1);
-    void replyToServer(const QString &command, const QString &json_data);
-    void notifyServer(const QString &command, const QString &json_data);
+                   const QString &jsonData, int timeout = -1);
+    void replyToServer(const QString &command, const QString &jsonData);
+    void notifyServer(const QString &command, const QString &jsonData);
 
-    void callLua(const QString &command, const QString &json_data);
+    void callLua(const QString &command, const QString &jsonData);
     LuaFunction callback;
 
 signals:
diff --git a/src/network/router.cpp b/src/network/router.cpp
index bd446c95..e618a532 100644
--- a/src/network/router.cpp
+++ b/src/network/router.cpp
@@ -50,7 +50,7 @@ void Router::setReplyReadySemaphore(QSemaphore *semaphore)
 }
 
 void Router::request(int type, const QString& command,
-                     const QString& json_data, int timeout)
+                     const QString& jsonData, int timeout)
 {
     // In case a request is called without a following waitForReply call
     if (replyReadySemaphore.available() > 0)
@@ -70,30 +70,30 @@ void Router::request(int type, const QString& command,
     body << requestId;
     body << type;
     body << command;
-    body << json_data;
+    body << jsonData;
     body << timeout;
 
     emit messageReady(QJsonDocument(body).toJson(QJsonDocument::Compact));
 }
 
-void Router::reply(int type, const QString& command, const QString& json_data)
+void Router::reply(int type, const QString& command, const QString& jsonData)
 {
     QJsonArray body;
     body << this->requestId;
     body << type;
     body << command;
-    body << json_data;
+    body << jsonData;
 
     emit messageReady(QJsonDocument(body).toJson(QJsonDocument::Compact));
 }
 
-void Router::notify(int type, const QString& command, const QString& json_data)
+void Router::notify(int type, const QString& command, const QString& jsonData)
 {
     QJsonArray body;
     body << -2;         // requestId = -2 mean this is for notification
     body << type;
     body << command;
-    body << json_data;
+    body << jsonData;
 
     emit messageReady(QJsonDocument(body).toJson(QJsonDocument::Compact));
 }
@@ -150,14 +150,14 @@ void Router::handlePacket(const QByteArray& rawPacket)
     int requestId = packet[0].toInt();
     int type = packet[1].toInt();
     QString command = packet[2].toString();
-    QString json_data = packet[3].toString();
+    QString jsonData = packet[3].toString();
 
     if (type & TYPE_NOTIFICATION) {
         if (type & DEST_CLIENT) {
-            ClientInstance->callLua(command, json_data);
+            ClientInstance->callLua(command, jsonData);
         } else {
-            // Add the uid of sender to json_data
-            QJsonArray arr = QJsonDocument::fromJson(json_data.toUtf8()).array();
+            // Add the uid of sender to jsonData
+            QJsonArray arr = QJsonDocument::fromJson(jsonData.toUtf8()).array();
             arr.prepend(
                 (int)qobject_cast<ServerPlayer *>(parent())->getUid()
             );
@@ -169,7 +169,7 @@ void Router::handlePacket(const QByteArray& rawPacket)
         this->requestTimeout = packet[4].toInt();
 
         if (type & DEST_CLIENT) {
-            qobject_cast<Client *>(parent())->callLua(command, json_data);
+            qobject_cast<Client *>(parent())->callLua(command, jsonData);
         } else {
             // requesting server is not allowed
             Q_ASSERT(false);
@@ -187,7 +187,7 @@ void Router::handlePacket(const QByteArray& rawPacket)
             requestStartTime.secsTo(QDateTime::currentDateTime()))
             return;
 
-        m_reply = json_data;
+        m_reply = jsonData;
         // TODO: callback?
         qDebug() << rawPacket << Qt::endl;
 
diff --git a/src/network/router.h b/src/network/router.h
index 9e7a8ba0..3b2c987a 100644
--- a/src/network/router.h
+++ b/src/network/router.h
@@ -37,9 +37,9 @@ public:
     void setReplyReadySemaphore(QSemaphore *semaphore);
 
     void request(int type, const QString &command,
-                 const QString &json_data, int timeout);
-    void reply(int type, const QString &command, const QString &json_data);
-    void notify(int type, const QString &command, const QString &json_data);
+                 const QString &jsonData, int timeout);
+    void reply(int type, const QString &command, const QString &jsonData);
+    void notify(int type, const QString &command, const QString &jsonData);
 
     int getTimeout() const;
 
diff --git a/src/server/room.cpp b/src/server/room.cpp
index fca5477a..f84b4777 100644
--- a/src/server/room.cpp
+++ b/src/server/room.cpp
@@ -80,9 +80,9 @@ void Room::addPlayer(ServerPlayer *player)
     players.append(player);
     player->setRoom(this);
     if (isLobby()) {
-        player->doNotify("enter_lobby", "{}");
+        player->doNotify("EnterLobby", "[]");
     } else {
-        player->doNotify("enter_room", "{}");
+        player->doNotify("EnterRoom", "[]");
     }
     qDebug() << "Player #" << player->getUid() << " entered room";
     emit playerAdded(player);
@@ -99,7 +99,7 @@ void Room::removePlayer(ServerPlayer *player)
         emit abandoned();
     } else if (player == owner) {
         setOwner(players.first());
-        owner->doNotify("room_owner", "{}");
+        owner->doNotify("RoomOwner", "[]");
     }
 }
 
@@ -143,10 +143,10 @@ void Room::doNotify(const QList<ServerPlayer *> targets, int timeout)
 }
 
 void Room::doBroadcastNotify(const QList<ServerPlayer *> targets,
-                             const QString& command, const QString& json_data)
+                             const QString& command, const QString& jsonData)
 {
     foreach (ServerPlayer *p, targets) {
-        p->doNotify(command, json_data);
+        p->doNotify(command, jsonData);
     }
 }
 
diff --git a/src/server/room.h b/src/server/room.h
index 40e366e4..8fa9b4db 100644
--- a/src/server/room.h
+++ b/src/server/room.h
@@ -44,7 +44,7 @@ public:
     void doBroadcastNotify(
         const QList<ServerPlayer *> targets,
         const QString &command,
-        const QString &json_data
+        const QString &jsonData
     );
 
 signals:
diff --git a/src/server/server.cpp b/src/server/server.cpp
index 4746befe..9c28c214 100644
--- a/src/server/server.cpp
+++ b/src/server/server.cpp
@@ -74,17 +74,17 @@ void Server::updateRoomList()
 {
     QJsonArray arr;
     foreach (Room *room, rooms) {
-        QJsonObject obj;
-        obj["roomId"] = (int)room->getId();
-        obj["roomName"] = room->getName();
-        obj["gameMode"] = "Role";
-        obj["playerNum"] = room->getPlayers().count();
-        obj["capacity"] = (int)room->getCapacity();
+        QJsonArray obj;
+        obj << (int)room->getId();  // roomId
+        obj << room->getName();     // roomName
+        obj << "Role";              // gameMode
+        obj << room->getPlayers().count();  // playerNum
+        obj << (int)room->getCapacity();    // capacity
         arr << obj;
     }
     lobby()->doBroadcastNotify(
         lobby()->getPlayers(),
-        "update_room_list",
+        "UpdateRoomList",
         QJsonDocument(arr).toJson()
     );
 }
@@ -100,7 +100,6 @@ void Server::processNewConnection(ClientSocket* client)
     qDebug() << "His address is " << client->peerAddress();
 #endif
 
-    //player->doNotify("enter_lobby", "{}");
     lobby()->addPlayer(player);
 }
 
@@ -114,7 +113,7 @@ void Server::onRoomAbandoned()
 
 void Server::onUserDisconnected()
 {
-    // TODO
+    qobject_cast<ServerPlayer *>(sender())->setStateString("offline");
 }
 
 void Server::onUserStateChanged()
diff --git a/src/server/server.h b/src/server/server.h
index 4df06172..347efad1 100644
--- a/src/server/server.h
+++ b/src/server/server.h
@@ -31,7 +31,7 @@ public:
 
     void updateRoomList();
 
-    void callLua(const QString &command, const QString &json_data);
+    void callLua(const QString &command, const QString &jsonData);
     LuaFunction callback;
 
 signals:
diff --git a/src/server/serverplayer.cpp b/src/server/serverplayer.cpp
index 48ab5550..887fdb92 100644
--- a/src/server/serverplayer.cpp
+++ b/src/server/serverplayer.cpp
@@ -52,22 +52,22 @@ void ServerPlayer::speak(const QString& message)
     ;
 }
 
-void ServerPlayer::doRequest(const QString& command, const QString& json_data, int timeout)
+void ServerPlayer::doRequest(const QString& command, const QString& jsonData, int timeout)
 {
     int type = Router::TYPE_REQUEST | Router::SRC_SERVER | Router::DEST_CLIENT;
-    router->request(type, command, json_data, timeout);
+    router->request(type, command, jsonData, timeout);
 }
 
-void ServerPlayer::doReply(const QString& command, const QString& json_data)
+void ServerPlayer::doReply(const QString& command, const QString& jsonData)
 {
     int type = Router::TYPE_REPLY | Router::SRC_SERVER | Router::DEST_CLIENT;
-    router->reply(type, command, json_data);
+    router->reply(type, command, jsonData);
 }
 
-void ServerPlayer::doNotify(const QString& command, const QString& json_data)
+void ServerPlayer::doNotify(const QString& command, const QString& jsonData)
 {
     int type = Router::TYPE_NOTIFICATION | Router::SRC_SERVER | Router::DEST_CLIENT;
-    router->notify(type, command, json_data);
+    router->notify(type, command, jsonData);
 }
 
 void ServerPlayer::prepareForRequest(const QString& command, const QVariant& data)
diff --git a/src/server/serverplayer.h b/src/server/serverplayer.h
index af1def6b..40b01ee2 100644
--- a/src/server/serverplayer.h
+++ b/src/server/serverplayer.h
@@ -25,9 +25,9 @@ public:
     void speak(const QString &message);
 
     void doRequest(const QString &command,
-                   const QString &json_data, int timeout = -1);
-    void doReply(const QString &command, const QString &json_data);
-    void doNotify(const QString &command, const QString &json_data);
+                   const QString &jsonData, int timeout = -1);
+    void doReply(const QString &command, const QString &jsonData);
+    void doNotify(const QString &command, const QString &jsonData);
 
     void prepareForRequest(const QString &command,
                            const QVariant &data = QVariant());
diff --git a/src/ui/qmlbackend.cpp b/src/ui/qmlbackend.cpp
index f9a294be..b0a81f80 100644
--- a/src/ui/qmlbackend.cpp
+++ b/src/ui/qmlbackend.cpp
@@ -18,7 +18,7 @@ void QmlBackend::startServer(ushort port)
 
         if (!server->listen(QHostAddress::Any, port)) {
             server->deleteLater();
-            emit notifyUI("error_msg", tr("Cannot start server!"));
+            emit notifyUI("ErrorMsg", tr("Cannot start server!"));
         }
     }
 }
@@ -28,7 +28,7 @@ void QmlBackend::joinServer(QString address)
     class Client *client = new class Client(this);
     connect(client, &Client::error_message, [this, client](const QString &msg){
         client->deleteLater();
-        emit notifyUI("error_msg", msg);
+        emit notifyUI("ErrorMsg", msg);
     });
     QString addr = "127.0.0.1";
     ushort port = 9527u;
@@ -44,14 +44,14 @@ void QmlBackend::joinServer(QString address)
     client->connectToHost(QHostAddress(addr), port);
 }
 
-void QmlBackend::replyToServer(const QString& command, const QString& json_data)
+void QmlBackend::replyToServer(const QString& command, const QString& jsonData)
 {
-    ClientInstance->replyToServer(command, json_data);
+    ClientInstance->replyToServer(command, jsonData);
 }
 
-void QmlBackend::notifyServer(const QString& command, const QString& json_data)
+void QmlBackend::notifyServer(const QString& command, const QString& jsonData)
 {
-    ClientInstance->notifyServer(command, json_data);
+    ClientInstance->notifyServer(command, jsonData);
 }
 
 void QmlBackend::quitLobby()
diff --git a/src/ui/qmlbackend.h b/src/ui/qmlbackend.h
index 0e7f5373..b00acbe1 100644
--- a/src/ui/qmlbackend.h
+++ b/src/ui/qmlbackend.h
@@ -18,18 +18,18 @@ public:
     QmlBackend(QObject *parent = nullptr);
 
     // For lua use
-    void emitNotifyUI(const char *command, const char *json_data) {
-        emit notifyUI(command, json_data);
+    void emitNotifyUI(const char *command, const char *jsonData) {
+        emit notifyUI(command, jsonData);
     }
 
 signals:
-    void notifyUI(const QString &command, const QString &json_data);
+    void notifyUI(const QString &command, const QString &jsonData);
 
 public slots:
     void startServer(ushort port);
     void joinServer(QString address);
-    void replyToServer(const QString &command, const QString &json_data);
-    void notifyServer(const QString &command, const QString &json_data);
+    void replyToServer(const QString &command, const QString &jsonData);
+    void notifyServer(const QString &command, const QString &jsonData);
 
     // Lobby
     void quitLobby();