Update README

Author: MikeMcl

README.md

@@ -3,51 +3,77 @@
 The light version of [decimal.js](https://github.com/MikeMcl/decimal.js/), an arbitrary-precision Decimal type for JavaScript.
 
 <br />
-[![Build Status](https://travis-ci.org/MikeMcl/decimal.js-light.svg)](https://travis-ci.org/MikeMcl/decimal.js-light)  
+[![Build Status](https://travis-ci.org/MikeMcl/decimal.js-light.svg)](https://travis-ci.org/MikeMcl/decimal.js-light)
 <br />
 
-The API is more or less a subset of the API of *decimal.js*. 
+This library is the newest of the family of libraries: [bignumber.js](https://github.com/MikeMcl/bignumber.js/), [big.js](https://github.com/MikeMcl/big.js/), [decimal.js](https://github.com/MikeMcl/decimal.js/) and *decimal.js-light*.<br>
+The API is more or less a subset of the API of *decimal.js*.
 
 ![API](https://raw.githubusercontent.com/MikeMcl/decimal.js-light/gh-pages/API.png)
 
-Size of *decimal.js-light* minified: 12.7 KB.  
-Size of *decimal.js* minified: 32.1 KB. 
+__Differences between this library and *decimal.js*__
 
-Other differences are that this library does not include `NaN`, `Infinity` or `-0` as legitimate values, or work with values in other bases. 
+Size of *decimal.js* minified: 32.1 KB.<br>
+Size of *decimal.js-light* minified: 12.7 KB.
 
-Also, here, the `Decimal.round` property is just the default rounding mode for `toDecimalPlaces`, `toExponential`, `toFixed`, `toPrecision` and `toSignificantDigits`. It does not apply to arithmetic operations, which are simply truncated at the required precision.
+This library does not include `NaN`, `Infinity` or `-0` as legitimate values, or work with values in other bases.
 
-Another difference is that here the `naturalExponential`, `naturalLogarithm`, `logarithm`, and `toPower` methods have by default a limited precision of around 100 digits. This limit can be increased by changing the value of `LN10` (the natural logarithm of ten) in the source code, or at runtime as shown below.
+Here, the `Decimal.round` property is just the default rounding mode for `toDecimalPlaces`, `toExponential`, `toFixed`, `toPrecision` and `toSignificantDigits`. It does not apply to arithmetic operations, which are simply truncated at the required precision.
+
+If rounding is required just apply it explicitly, for example
+
+```js
+x = new Decimal(2);
+y = new Decimal(3);
+
+// decimal.js
+x.dividedBy(y).toString();                       // '0.66666666666666666667'
+
+// decimal.js-light
+x.dividedBy(y).toString();                       // '0.66666666666666666666'
+x.dividedBy(y).toDecimalPlaces(19).toString();   // '0.6666666666666666667'
+```
+
+The `naturalExponential`, `naturalLogarithm`, `logarithm`, and `toPower` methods in this library have by default a limited precision of around 100 digits. This limit can be increased at runtime using the `LN10` (the natural logarithm of ten) configuration object property.
+
+For example, if a maximum precision of 400 digits is required for these operations use
 
 ```js
 // 415 digits
-Decimal.set({ 
+Decimal.set({
   LN10: '2.302585092994045684017991454684364207601101488628772976033327900967572609677352480235997205089598298341967784042286248633409525465082806756666287369098781689482907208325554680843799894826233198528393505308965377732628846163366222287698219886746543667474404243274365155048934314939391479619404400222105101714174800368808401264708068556774321622835522011480466371565912137345074785694768346361679210180644507064800027'
 });
 ```
 
+In this library the `e` property of a Decimal is the base 10000000 exponent, not the base 10 exponent as in *decimal.js*.<br>
+Use the `exponent` method to get the base 10 exponent.
+
 ## Quickstart
 
+Browser:
+
+```html
+<script src='path/to/decimal.js-light'></script>
+```
+
+Node package manager:
+
+```shell
+$ npm install --save decimal.js-light
+```
+
 ```js
-// Adjust the global configuration if required.
+// Node.js
+var Decimal = require('decimal.js-light');
+
+// Adjust the global configuration if required (these are the defaults)
 Decimal.set({
   precision: 20,
   rounding: Decimal.ROUND_HALF_UP,
   toExpNeg: -7,
   toExpPos: 21
 });
 
-x = new Decimal(2);
-y = new Decimal(3);
-
-// decimal.js
-x.dividedBy(y).toString();                       // '0.66666666666666666667'
-
-// decimal.js-light
-x.dividedBy(y).toString();                       // '0.66666666666666666666'
-
-x.dividedBy(y).toDecimalPlaces(19).toString();   // '0.6666666666666666667'
-
 phi = new Decimal('1.61803398874989484820458683436563811772030917980576');
 
 phi.toFixed(10);    // '1.6180339887'