diff --git a/README.md b/README.md
index 9428ed4..ce594c3 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,7 @@ A lightweight Node.js and TypeScript dependency injection framework powered [tsy
 ### Table of Contents
 - [Installation](#installation)
 - [Quick Start](#quick-start)
+- [coreSettings](#coresettings)
 - [Decorators](#decorators)
   - [Controller()](#controller)
   - [Get(), Post(), Put(), Delete(), Head(), Patch(), Options()](#get-post-put-delete-head-patch-options)
@@ -22,6 +23,7 @@ A lightweight Node.js and TypeScript dependency injection framework powered [tsy
   - [Events](#events)
   - [EndpointOptions](#endpointoptions)
 
+
 ## Installation
 
 ```sh
@@ -62,13 +64,16 @@ export default class ResponseModel<T> {
 
 ```typescript
 // application.ts
-import { Modules, PermissionModule, HandleErrorResponse, DataSource, dataSourceList, EventsModules } from "helocore";
+import { Modules, PermissionModule, HandleErrorResponse, DataSource, dataSourceList, EventsModules, coreSettings } from "helocore";
 import TestController from './TestController'
 import PermissionControl from './PermissionControl'
 import Redis from './Redis'
 import ResponseModel from './ResponseModel'
 import EventsTest from './Events'
 
+// default true
+coreSettings.logger = false
+
 // Controller layer defining
 Modules([
   TestController
@@ -118,6 +123,10 @@ fastify.register((app, _, done) => {
 fastify.listen({ port: 3000 }, () => console.log('API is Running'))
 ```
 
+## coreSettings
+
+- **logger**: helocore logger with trace_id to command prompt. it can reachable from `req.trace_id`
+
 ## Decorators
 
 ### Controller()
diff --git a/example/application.ts b/example/application.ts
index 46b9cec..51c7c01 100644
--- a/example/application.ts
+++ b/example/application.ts
@@ -1,4 +1,4 @@
-import { HandleErrorResponse, Modules, EventsModule } from "helocore"
+import { HandleErrorResponse, Modules, EventsModule, coreSettings } from "helocore"
 
 import UploadController from "./src/controllers/UploadController"
 import EventController from "./src/controllers/EventController"
@@ -6,6 +6,8 @@ import ServiceResponse from "./src/models/ServiceResponse"
 import { handleError } from "./src/modules/HandleError"
 import EventTest from "./src/events/Events"
 
+coreSettings.logger = true
+
 Modules([
   UploadController,
   EventController
diff --git a/src/Settings.ts b/src/Settings.ts
index 6a38e1d..e3aeb9e 100644
--- a/src/Settings.ts
+++ b/src/Settings.ts
@@ -3,5 +3,8 @@ export const coreSettings: TSettings = {
 }
 
 type TSettings = {
+  /**
+   * Default true
+   */
   logger: boolean
 }
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