Update D3.md

D3.md

@@ -37,6 +37,12 @@ d3.selectAll('div').classed('frog', false); //removes the class and returns the
 d3.selectAll('div').append('span'); //append html to a selection and return appended element
 ```
 
+### .remove()
+
+```javascript
+d3.selectAll('div').remove(); //remvoe selection
+```
+
 ### .html()
 
 ```javascript