diff --git a/source/_components/sensor.fastdotcom.markdown b/source/_components/sensor.fastdotcom.markdown
index ff945ef847f..5e9eb9d22af 100644
--- a/source/_components/sensor.fastdotcom.markdown
+++ b/source/_components/sensor.fastdotcom.markdown
@@ -70,3 +70,4 @@ There is also a service named `sensor.update_fastdotcom` that you can use to run
 ## {% linkable_title Notes %}
 
 - When running on Raspberry Pi, just note that the maximum speed is limited by its 100 Mbit/s LAN adapter.
+- This entity will return the maximum measured speed during an 15 second test.