diff --git a/source/_components/sensor.http.markdown b/source/_components/sensor.http.markdown
index 5f912103905..c119330eb41 100644
--- a/source/_components/sensor.http.markdown
+++ b/source/_components/sensor.http.markdown
@@ -13,6 +13,11 @@ ha_release: pre 0.7
 ha_iot_class: "Local Push"
 ---
 
+
+The HTTP sensor is dynamically created with the first request that is made to its URL. You don't have to define it in the configuration first.
+ 
+The sensor will then exist as long as Home Assistant is running. After a restart of Home Assistant the sensor will be gone until it is triggered again.
+
 The URL for a sensor looks like the example below:
 
 ```bash