updated readme d3h.i

bahmutov · Apr 4, 2014 · 0091bcd · 0091bcd
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commit 0091bcd
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diff --git a/README.md b/README.md
@@ -100,6 +100,16 @@ Same chaining as `d3h.d` but operates on the second argument, usually the index
 });
 ```
 
+If you want to return the index element, you need to execute the function to create the callback
+
+```js
+.y(d3h.i())
+// same as
+.y(function (d, i) {
+  return i;
+});
+```
+
 ### d3h.noop
 
 Same as `function () {}`