Describe when the random sensor changes value (home-assistant#3064)

wildcomputations · fabaff · commit c83d11a0b486 · 2017-07-27T11:39:02.000+02:00
* Document update frequency Documented that the random number changes every 30 seconds according to http://fabian-affolter.ch/blog/random-sensor/ * Learned the source of the 30s polling frequency
diff --git a/source/_components/sensor.random.markdown b/source/_components/sensor.random.markdown
@@ -14,7 +14,7 @@ ha_release: 0.32
 ---
 
 
-The `random` sensor platform is creating random sensor values (integers) out of a given range. This can be useful if you want to test automation rules. 
+The `random` sensor platform is creating random sensor values (integers) out of a given range. This can be useful if you want to test automation rules. It generates a new value every time it is polled.
 
 To enable the random sensor, add the following lines to your `configuration.yaml`:
 
@@ -31,3 +31,6 @@ Configuration variables:
 - **maximum** (*Optional*): Upper limit for the values. Defaults to `20`.
 - **unit_of_measurement** (*Optional*): Defines the units of measurement of the sensor, if any.
 
+See the [entity component options][entity-docs] to control how often the main component polls the random sensor. The default is 30 seconds.
+
+[entity-docs]: https://home-assistant.io/docs/configuration/platform_options/
