NB that not possible to register 3 sensors

Not possible automatically register all 3 sensors (PM, BME280 and DNMS)
opendata-stuttgart#117

content/dnms/en/05-register.md

@@ -17,3 +17,9 @@ Home -> (Login) - Sensors -> Register sensor
 * internal name makes it easier to separate if you have multiple sensors (like garden, sensor for mom,...)
 * the surroundings of the station - e.g. height above ground, side of the road, high traffic volume, free field or similar
 
+
+#### NB!
+Currently it is not possible to register using the site both PM sensor, temp/humidity and DNMS sensor connected to one NodeMCU.
+For now it can only be done manually by sending a request to tech (at) sensor.community.
+See [issue](https://github.com/opendata-stuttgart/sensor.community/issues/117
+) for details.