Added npm reference.

README.md

@@ -15,7 +15,7 @@ A Javascript library for arbitrary-precision arithmetic.
   - No dependencies
   - Comprehensive documentation and test set 
 
-If a smaller, simpler library is required see [big.js](https://github.com/MikeMcl/big.js/).   
+If an even smaller and simpler library is required see [big.js](https://github.com/MikeMcl/big.js/).   
 It's half the size with half the methods and only works with decimal numbers; it also does not allow `NaN` or `Infinity`, or have the configuration options of this library. 
 
 ## Load
@@ -37,6 +37,16 @@ or put it in a *node_modules* directory within the directory and use
 
     var BigNumber = require('bignumber'); 
 
+The library is also available from the [npm](https://npmjs.org/) registry, so
+
+    $ npm install bignumber.js
+
+will install this entire directory in a *node_modules* directory within the current directory.
+
+It can then be loaded with  
+
+    var BigNumber = require('bignumber.js'); 
+ 
 To load with AMD loader libraries such as [requireJS](http://requirejs.org/):
 
     require(['bignumber'], function(BigNumber) {  
@@ -159,7 +169,7 @@ The *perf* directory contains two applications and a *lib* directory containing
 * ICU4J: com.ibm.icu.math.BigDecimal    
 <https://github.com/dtrebbien/BigDecimal.js>     
 
-The BigDecimal in Node's npm registry is the GWT version; unfortunately, it has serious bugs, see the Node script *perf/lib/bigdecimal_GWT/bugs.js for examples of flaws in its *remainder*, *divide* and *compareTo* methods.   
+The BigDecimal in Node's npm registry is the GWT version. Despite its seeming popularity I have found it to have some serious bugs, see the Node script *perf/lib/bigdecimal_GWT/bugs.js* for examples of flaws in its *remainder*, *divide* and *compareTo* methods.   
 
 *bigtime.js* is a Node command-line application which tests the performance of bignumber.js against the GWT version of BigDecimal from the npm registry.  
 
@@ -200,4 +210,3 @@ See LICENCE.
 
 ####1.0.0
 * 8/11/2012 Initial release   
-* 9/11/12 Added package.json for npm