diff --git a/README.md b/README.md
index f48ea58..87a571e 100644
--- a/README.md
+++ b/README.md
@@ -557,7 +557,7 @@ params.append('param2', 'value2');
 axios.post('/foo', params);
 ```
 
-> Note that `URLSearchParams` is not supported by all browsers, but there is a [polyfill](https://github.com/WebReflection/url-search-params) available (make sure to polyfill the global environment).
+> Note that `URLSearchParams` is not supported by all browsers (see [caniuse.com](http://www.caniuse.com/#feat=urlsearchparams)), but there is a [polyfill](https://github.com/WebReflection/url-search-params) available (make sure to polyfill the global environment).
 
 Alternatively, you can encode data using the [`qs`](https://github.com/ljharb/qs) library: