diff --git a/examples/cocos-creator-multiplayer/backend/src/index.ts b/examples/cocos-creator-multiplayer/backend/src/index.ts
index 8c89268..b626a81 100644
--- a/examples/cocos-creator-multiplayer/backend/src/index.ts
+++ b/examples/cocos-creator-multiplayer/backend/src/index.ts
@@ -4,7 +4,7 @@ import { WsConnection, WsServer } from "tsrpc";
 import { Room } from './models/Room';
 import { serviceProto, ServiceType } from './shared/protocols/serviceProto';
 
-// Create the Server
+// 创建 TSRPC WebSocket Server
 export const server = new WsServer(serviceProto, {
     port: 3000,
     json: true
@@ -22,15 +22,16 @@ server.flows.postDisconnectFlow.push(v => {
 
 export const roomInstance = new Room(server);
 
-// Initialize before server start
+// 初始化
 async function init() {
+    // 挂载 API 接口
     await server.autoImplementApi(path.resolve(__dirname, 'api'));
 
     // TODO
     // Prepare something... (e.g. connect the db)
 };
 
-// Entry function
+// 启动入口点
 async function main() {
     await init();
     await server.start();
diff --git a/examples/cocos-creator-multiplayer/backend/src/models/Room.ts b/examples/cocos-creator-multiplayer/backend/src/models/Room.ts
index 36d03b8..487fb7c 100644
--- a/examples/cocos-creator-multiplayer/backend/src/models/Room.ts
+++ b/examples/cocos-creator-multiplayer/backend/src/models/Room.ts
@@ -9,7 +9,7 @@ import { ServiceType } from "../shared/protocols/serviceProto";
  */
 export class Room {
 
-    // 次数/秒
+    // 帧同步频率，次数/秒
     syncRate = gameConfig.syncRate;
     nextPlayerId = 1;
 
diff --git a/examples/cocos-creator-multiplayer/backend/src/shared/game/GameSystem.ts b/examples/cocos-creator-multiplayer/backend/src/shared/game/GameSystem.ts
index 79a40b6..d12e9c0 100644
--- a/examples/cocos-creator-multiplayer/backend/src/shared/game/GameSystem.ts
+++ b/examples/cocos-creator-multiplayer/backend/src/shared/game/GameSystem.ts
@@ -2,6 +2,7 @@ import { gameConfig } from "./gameConfig";
 import { ArrowState } from "./state/ArrowState";
 import { PlayerState } from "./state/PlayerState";
 
+// 状态定义
 export interface GameSystemState {
     // 当前的时间（游戏时间）
     now: number,
@@ -123,11 +124,12 @@ export interface PlayerLeave {
     type: 'PlayerLeave',
     playerId: number
 }
+// 时间流逝
 export interface TimePast {
     type: 'TimePast',
     dt: number
 }
-
+// 输入定义
 export type GameSystemInput = PlayerMove
     | PlayerAttack
     | PlayerJoin
diff --git a/examples/cocos-creator-multiplayer/backend/src/shared/game/gameConfig.ts b/examples/cocos-creator-multiplayer/backend/src/shared/game/gameConfig.ts
index dcf3ef2..fad7761 100644
--- a/examples/cocos-creator-multiplayer/backend/src/shared/game/gameConfig.ts
+++ b/examples/cocos-creator-multiplayer/backend/src/shared/game/gameConfig.ts
@@ -3,8 +3,12 @@ export const gameConfig = {
 
     moveSpeed: 10,
 
+    // 箭矢飞行时间（毫秒）
     arrowFlyTime: 500,
+    // 箭矢投掷距离
     arrowDistance: 8,
+    // 箭矢落地命中判定半径
     arrowAttackRadius: 2,
+    // 被箭矢几种后的晕眩时间（毫秒）
     arrowDizzyTime: 1000
 }
\ No newline at end of file
diff --git a/examples/cocos-creator-multiplayer/backend/src/shared/protocols/PtlJoin.ts b/examples/cocos-creator-multiplayer/backend/src/shared/protocols/PtlJoin.ts
index 0f85d8a..63e07de 100644
--- a/examples/cocos-creator-multiplayer/backend/src/shared/protocols/PtlJoin.ts
+++ b/examples/cocos-creator-multiplayer/backend/src/shared/protocols/PtlJoin.ts
@@ -1,11 +1,14 @@
 import { GameSystemState } from "../game/GameSystem";
 
+/** 加入房间 */
 export interface ReqJoin {
 
 }
 
 export interface ResJoin {
+    /** 加入房间后，自己的 ID */
     playerId: number,
+    /** 状态同步：一次性同步当前状态 */
     gameState: GameSystemState
 }
 
diff --git a/examples/cocos-creator-multiplayer/backend/src/shared/protocols/client/MsgClientInput.ts b/examples/cocos-creator-multiplayer/backend/src/shared/protocols/client/MsgClientInput.ts
index b5cfba2..c22efad 100644
--- a/examples/cocos-creator-multiplayer/backend/src/shared/protocols/client/MsgClientInput.ts
+++ b/examples/cocos-creator-multiplayer/backend/src/shared/protocols/client/MsgClientInput.ts
@@ -1,5 +1,6 @@
 import { PlayerAttack, PlayerMove } from "../../game/GameSystem";
 
+/** 发送自己的输入 */
 export interface MsgClientInput {
     sn: number,
     inputs: ClientInput[]
diff --git a/examples/cocos-creator-multiplayer/backend/src/shared/protocols/server/MsgFrame.ts b/examples/cocos-creator-multiplayer/backend/src/shared/protocols/server/MsgFrame.ts
index 081e125..f45c277 100644
--- a/examples/cocos-creator-multiplayer/backend/src/shared/protocols/server/MsgFrame.ts
+++ b/examples/cocos-creator-multiplayer/backend/src/shared/protocols/server/MsgFrame.ts
@@ -1,6 +1,11 @@
 import { GameSystemInput } from "../../game/GameSystem";
 
+/** 
+ * 服务端定期广播的同步帧
+ * 包含了这一段期间所有输入
+ */
 export interface MsgFrame {
     inputs: GameSystemInput[],
+    /** 当前用户提交的，经服务端确认的最后一条输入的 SN */
     lastSn?: number
 }
\ No newline at end of file