Add note about google maps API loads

Author: darksidelemm

index.html

@@ -102,6 +102,7 @@ <h4>How do I receive?</h4>
                 <b>Note that you must be running at least <a href="https://github.com/projecthorus/radiosonde_auto_rx/releases" target="_blank">v1.5.1</a> to show up on Sondehub v2!</b>
 
                 <h4>Support Us!</h4>
+                Google Maps and AWS hosting unfortunately does not come cheap. If you're seeing a greyed out map, that's because we've exceeded our free Google Maps page loads. <br/>
                 If you use SondeHub regularly, please consider <a href="https://www.patreon.com/sondehub" target="_blank">supporting us on Patreon</a>, or with a <a href="https://sondehub.org/go/donate" target="_blank">donation on Paypal</a>.
 
                 <h4>Amateur HAB Launches?</h4>