Update README.md

Real-time-finance · Jul 17, 2020 · 08636c6 · 08636c6
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diff --git a/README.md b/README.md
@@ -13,12 +13,12 @@ npm install ws
 ```
 
 # Usage example
-
+Use stock symbol to receive datas. In this example we use EURUSD (forex), AAPL (apple - nasdaq), MSFT (microsoft - nasdaq) and MC.PA (lvmh - cac40)
 ```javascript
 const WebSocket = require('ws');
 const ws = new WebSocket("ws:https://realtimefinance.io, {
  headers: {
- "api_key": "demo",
+ "API-X-KEY": "demo",
  "symbol" : "EURUSD,AAPL,MSFT,MC.PA"
  }
 });