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+# is-natural-number.js
+
+[![NPM version](https://img.shields.io/npm/v/is-natural-number.svg)](https://www.npmjs.com/package/is-natural-number)
+[![Bower version](https://img.shields.io/bower/v/is-natural-number.svg)](https://github.com/shinnn/is-natural-number.js/releases)
+[![Build Status](https://travis-ci.org/shinnn/is-natural-number.js.svg)](https://travis-ci.org/shinnn/is-natural-number.js)
+[![Coverage Status](https://img.shields.io/coveralls/shinnn/is-natural-number.js.svg)](https://coveralls.io/r/shinnn/is-natural-number.js?branch=master)
+[![devDependency Status](https://david-dm.org/shinnn/is-natural-number.js/dev-status.svg)](https://david-dm.org/shinnn/is-natural-number.js#info=devDependencies)
+
+Check if a value is a [natural number](https://wikipedia.org/wiki/Natural_number)
+
+## Installation
+
+### Package managers
+
+#### [npm](https://www.npmjs.com/)
+
+```
+npm install is-natural-number
+```
+
+#### [Bower](http://bower.io/)
+
+```
+bower install is-natural-number
+```
+
+#### [Duo](http://duojs.org/)
+
+```javascript
+var isNaturalNumber = require('shinnn/is-natural-number.js');
+```
+
+### Standalone
+
+[Download the script file directly.](https://raw.githubusercontent.com/shinnn/is-natural-number.js/master/is-natural-number.js)
+
+## API
+
+### isNaturalNumber(*number*, *option*)
+
+*number*: `Number`  
+*option*: `Object`  
+Return: `Boolean`
+
+It returns `true` if the first argument is one of the natural numbers. If not, or the argument is not a number, it returns `false`.
+
+```javascript
+isNaturalNumber(10); //=> true
+
+isNaturalNumber(-10); //=> false
+isNaturalNumber(10.5); //=> false
+isNaturalNumber(Infinity); //=> false
+isNaturalNumber('10'); //=> false
+```
+
+*Check [the test](./test.js) for more detailed specifications.*
+
+#### option.includeZero
+
+Type: `Boolean`
+Default: `false`
+
+By default the number `0` is not regarded as a natural number.
+
+Setting this option `true` makes `0` regarded as a natural number.
+
+```javascript
+isNaturalNumber(0); //=> false
+isNaturalNumber(0, {includeZero: true}); //=> true
+```
+
+## License
+
+Copyright (c) 2014 - 2016 [Shinnosuke Watanabe](https://github.com/shinnn)
+
+Licensed under [the MIT License](./LICENSE).