diff --git a/README.md b/README.md
index 454a40b..9c3bed0 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,18 @@
 
 JavaScript Bitmessage library for both browserify and node.
 
+## Usage
+
+You need ES6 Promise available in order to use this module. Use some sort of ES6 runtime or just apply polyfill:
+
+```js
+require("es6-promise").polyfill();
+```
+
+```js
+var bitmessage = require("bitmessage");
+```
+
 ## License
 
 bitmessage - JavaScript Bitmessage library