diff --git a/README.md b/README.md
index f25c390..372a4d2 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ d you to open windows to keep you happy and healthy
 
 * solder everything according to the connection schema
 * get yourself a copy of esphome (https://esphome.io/) ```pip3 install esphome```
+* create a secrects.yaml file with your wifi settings (see also secrets.yaml.example)
 * compile the firmware with ```co2ampel=USER_ROOM esphome co2sensor.yaml run``` 
   * replace user with a nick that identifies you or your organisation
   * replace room with the place the sensor is located at