Note about SNTP for Shelly (home-assistant#19281)

* Note about SNTP for Shelly * Update source/_integrations/shelly.markdown Co-authored-by: Joakim Sørensen <[email protected]> * Update shelly.markdown Co-authored-by: Joakim Sørensen <[email protected]>
johanf85 · Sep 10, 2021 · a870b59 · a870b59
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diff --git 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