Add info about Opensky authentication (home-assistant#28642)

joostlek · frenck · web-flow · commit 1931a23d20e9 · 2023-08-28T16:52:16.000+02:00
Co-authored-by: Franck Nijhof &lt;frenck@frenck.nl&gt;
Co-authored-by: Franck Nijhof &lt;git@frenck.dev&gt;
diff --git a/source/_integrations/opensky.markdown b/source/_integrations/opensky.markdown
@@ -29,6 +29,12 @@ altitude:
   description: The maximum altitude in meters in which the planes are tracked. No input (or 0) means all planes in the area are tracked.
 {% endconfiguration_basic %}
 
+## Authentication
+
+By default, polling is done every 15 minutes not to hit the API limit.
+More API requests are allowed as authenticated users.
+You can add your credentials after setting up the integration.
+
 ## Events
 
 - **opensky_entry**: Fired when a flight enters the region.
