Update README.md

joonhocho · Aug 8, 2017 · 83dda68 · 83dda68
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@@ -14,6 +14,8 @@ FullContact Card Reader API Wrapper for Node.js
 npm install --save fullcontact-card-reader
 ```
 
+Requires `Promise`. Use [es6-promise](https://github.com/stefanpenner/es6-promise) if your Node.js version doesn't implement `Promise`.
+
 
 ### Usage
 ```javascript