diff --git a/docs/jsonp.md b/docs/jsonp.md
index f0ee9b38..1e2300f7 100644
--- a/docs/jsonp.md
+++ b/docs/jsonp.md
@@ -26,10 +26,11 @@ m.jsonp({
 
 ### Signature
 
-`promise = m.jsonp(options)`
+`promise = m.jsonp([url,] options)`
 
 Argument               | Type                              | Required | Description
 ---------------------- | --------------------------------- | -------- | ---
+`url`                  | `String`                          | No       | If present, it's equivalent to having the option `{url: url}`. Values passed to the `options` argument override options set via this shorthand.
 `options.url`          | `String`                          | Yes      | The URL to send the request to. The URL may be either absolute or relative, and it may contain [interpolations](#dynamic-urls).
 `options.data`         | `any`                             | No       | The data to be interpolated into the URL and serialized into the querystring.
 `options.type`         | `any = Function(any)`             | No       | A constructor to be applied to each object in the response. Defaults to the [identity function](https://en.wikipedia.org/wiki/Identity_function).