diff --git a/doc.md b/doc.md
index b82a420..09a0bc3 100644
--- a/doc.md
+++ b/doc.md
@@ -41,7 +41,7 @@ Later we'll see how to use the test without PHP, and how to configure the teleme
 
 __Important:__ keep all the files together; all paths are relative to the js file
 
-__Important:__ If you expect to serve more than ~500 tests per day, you will need to sign up to [ipinfo.io](https://ipinfo.io) and edit `getIP_ipInfo_apikey.php` to set your access token.
+__Important:__ If you expect to serve more than ~500 tests per day, you will need to sign up to [ipinfo.io](https://ipinfo.io) and edit `getIP_ipInfo_apikey.php` to set your access token. IpInfo.io has kindly offered free access to their APIs for users of this project, if you're interested, contact me at [info@fdossena.com](mailto:info@fdossena.com) and provide a description of what you intend to do with the project, and you'll get the API key.
 
 __Important:__ Make sure PHP is allowed to write to the directory where you're installing the speedtest because getIP.php needs to create a cache file to improve performance.