Add notes about polling

source/_integrations/rachio.markdown

@@ -38,7 +38,7 @@ They will be automatically added if the Rachio integration is loaded.
 
 <div class='note'>
 
-In order for Rachio switches and sensors to update, your Home Assistant instance must be accessible from the internet, either via Home Assistant Cloud or another method. See the [Remote Access documentation](/docs/configuration/remote/) for more information.
+In order for Rachio switches and sensors to update, your Home Assistant instance must be accessible from the internet, either via Home Assistant Cloud or another method. See the [Remote Access documentation](/docs/configuration/remote/) for more information. The smart hose timers use polling, and don't require external access to be setup.
 
 </div>
 
@@ -49,6 +49,10 @@ After setting up the integration, change the options to set the duration in minu
 
 </div>
 
+### Smart Hose Timers
+
+The Rachio smart hose timers are not currently capable of receiving real-time updates, and instead rely on polling. Because of this, the current state of valves started from a schedule or the physical button will not show up immediately. Polling occurs every 2 minutes when one base station is used, with an additional minute added for every additional base station to remain with the API rate limit. Up to 4 valves can be paired to a single base station.
+
 ### iFrame
 
 If you would like to see and control more detailed zone information, create an [iFrame](/integrations/panel_iframe/) that renders the Rachio web app.