diff --git a/README.md b/README.md
index daa8b7d..b707665 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,78 @@
 
 See [README](./nodejs)
 
+## Quick Start
+
+### Install
+```
+$ npm -i @hackmd/api
+```
+
+### Login and Create a note
+
+- Copy following into `index.js`
+
+```
+const { default: API } = require('@hackmd/api')
+
+const api = new API()
+
+api.login('your account', 'your password').then(() => {
+  api.newNote(`# Untitle Add By API`)
+})
+```
+
+- execute it by `node index.js`
+
+### Create a note from an example note
+
+```
+const { default: API, ExportType } = require('@hackmd/api')
+
+const api = new API()
+
+api.login('your account', 'your password').then(() => {
+  api.exportString('your note id', ExportType.MD).then((res) => {
+      api.newNote(res)
+  })
+})
+```
+
+## API Reference
+
+### API class
+
+`notice: There are not all the functions. I just write the functions which I am interested in`
+
+- `constructor(config?: APIOptions)`
+  - config: optional, [APIOptions](#APIOptions)
+- `login(email: string, password: string): Promise<void>` - method to login
+  - email: string
+  - password: string
+- `logout(): Promise<void>` - method to logout
+- `newNote(body: string, options?: NewNoteOption): Promise<void>` - method to add a new note
+  - body: string - the content you want to add in the new note, for example: `# api test`
+  - options: optional, [NewNoteOption](#NewNoteOption)
+- `exportString(noteId: string, type: ExportType): Promise<string>` - method to export a note
+  - noteId: string - the id in the url. If your url of the example note is `https://hackmd.io/XXXOOO`, your noteId is `XXXOOO`
+  - type: [ExportType](#ExportType) 
+
+#### APIOptions
+
+- serverUrl: string - optional, the url of the server, for example: `https://hackmd.io`
+- cookiePath: string - optional, the path where the cookies save in
+- enterprise: boolean - optional, I don't know what it is
+
+#### NewNoteOption
+- team: string - optional, the team id in the url
+
+#### ExportType
+
+- PDF: 0 - export to pdf
+- SLIDE: 1 - I don't know what it is
+- MD: 2 - export to markdown
+- HTML: 3 - export to html
+
 ## LICENSE
 
 MIT