add note about div precision

closes #6

README.md

@@ -43,6 +43,12 @@ Besides the **num** function, all of the other methods operate on the objects re
 ### div (value) ###
 > divide our num by {value} and return a new num
 
+```
+// note that `div` uses the precision of the numerator
+num('1').div('3.0') -> 0
+num('1.0').div('3') -> 0.3
+```
+
 ### neg ###
 > return a new num that is the negative
 

test/div.js

@@ -8,7 +8,6 @@ test('div', function() {
     assert.equal(num('1.0').div(2), '0.5');
     assert.equal(num('1.00').div(20), '0.05');
 
-    // TODO what should this really do?
     assert.equal(num('1.0').div(3), '0.3');
     assert.equal(num('1.000').div('3'), '0.333');
 });