diff --git a/source/_integrations/vicare.markdown b/source/_integrations/vicare.markdown
index 0934f9b2aac..d42265d72e9 100644
--- a/source/_integrations/vicare.markdown
+++ b/source/_integrations/vicare.markdown
@@ -44,6 +44,8 @@ The required Client ID can be obtained as follows:
 
 The `heating_type` can either be `auto` to automatically find the most suitable type for your device or one of `gas`, `oil`, `pellets`, `heatpump`, `fuelcell`, `hybrid`.
 
+Important: the redirect URI that you configure requires that you perform the initial setup on a device that has the ViCare application installed. If your device does not know how to handle the `vicare://` URL, you will receive an **Invalid credentials** notification and the setup procedure will fail. This means: install the ViCare app on your phone and set up the integration from your phone.
+
 Multiple device instances might be generated depending on the number of burners and/or circuits of your installation. If there is more than a single instance all devices are suffixed with the circuit or burner ID.
 
 ## Viessmann API limits