diff --git a/source/_integrations/shelly.markdown b/source/_integrations/shelly.markdown
index 686f20bf7aa..9b4a659348c 100644
--- a/source/_integrations/shelly.markdown
+++ b/source/_integrations/shelly.markdown
@@ -191,6 +191,11 @@ The firmware limits the transition time to 5 seconds.
 
 </div>
 
+## Additional info
+
+Shelly devices rely on [SNTP](https://en.wikipedia.org/wiki/Network_Time_Protocol#SNTP) for features like power measurement.
+Please check from the device Web UI that the configured server is reacheable.
+
 ## Known issues and limitations
 
 - Only supports firmware 1.8 and later