diff --git a/readme.md b/readme.md
index d351ad3..8fd7a5d 100644
--- a/readme.md
+++ b/readme.md
@@ -34,6 +34,8 @@ Fill in:
  - API key (if you don't have the API key, you can obtain it here: https://api.golemio.cz/api-keys/auth/sign-up) and 
  - number of departures to be displayed.
 
-Alternatively, the aswIds may be obtained directly or from  stops.txt file in GTFS files here: https://opendata.praha.eu/datasets/https%3A%2F%2Fapi.opendata.praha.eu%2Flod%2Fcatalog%2F9a6a1d8e-45b9-41de-b9ae-0bcec7126876 (asw_zone_id and asw_stop_id must be joined using "_" to get aswIds).
+It is only required to fill in API key once - for additional departure boards it should be prefilled in the config dialogue.
+
+AswIds may be also obtained directly or from stops.txt file in GTFS files here: https://opendata.praha.eu/datasets/https%3A%2F%2Fapi.opendata.praha.eu%2Flod%2Fcatalog%2F9a6a1d8e-45b9-41de-b9ae-0bcec7126876 (asw_zone_id and asw_stop_id must be joined using "_" to get aswIds).
 
 The success dialog will appear or an error will be displayed in the popup.
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