diff --git a/source/_integrations/trend.markdown b/source/_integrations/trend.markdown
index 83ffcda9d65..dbac93eacea 100644
--- a/source/_integrations/trend.markdown
+++ b/source/_integrations/trend.markdown
@@ -87,8 +87,7 @@ sensors:
 If the optional `sample_duration` and `max_samples` parameters are specified
 then multiple samples can be stored and used to detect long-term trends.
 
-Each time the state changes, a new sample is stored along with the sample time.
-Samples older than `sample_duration` seconds will be discarded.
+Each time the state changes, a new sample is stored along with the sample time. Samples older than `sample_duration` seconds will be discarded. The `max_samples` parameter must be large enough to store sensor updates over the requested duration. If you want to trend over two hours and your sensor updates every 120s then then `max_samples` must be at least 60, i.e., 7200/120 = 60.
 
 A trend line is then fitted to the available samples, and the gradient of this
 line is compared to `min_gradient` to determine the state of the trend sensor.
@@ -124,12 +123,14 @@ binary_sensor:
       temp_falling:
         entity_id: sensor.outside_temperature
         sample_duration: 7200
+        max_samples: 120
         min_gradient: -0.0008
         device_class: cold
 
       temp_rising:
         entity_id: sensor.outside_temperature
         sample_duration: 7200
+        max_samples: 120
         min_gradient: 0.0008
         device_class: heat
 ```