diff --git a/notify_signal_about_traccar_events.sh.conf.example b/notify_signal_about_traccar_events.sh.conf.example
index a05e698..cd637f1 100644
--- a/notify_signal_about_traccar_events.sh.conf.example
+++ b/notify_signal_about_traccar_events.sh.conf.example
@@ -33,7 +33,8 @@ message_event_other='%s triggered event "%s" in Traccar server.'
 # syntax works. Most notably lookarounds are unsupported in ERE.
 allow_unique_device_ids_posix_ere='^(901874|81919333|9991212)$'
 
-# signal-cli-rest-api config
+# signal-cli-rest-api config. These are all mandatory. Leaving them
+# empty or not declaring them at all will cause the script to exit.
 signal_sender_phone_number='+18005550199'
 signal_recipients_array='["group.ImxvbmdpdH=","recipient.21","+18005550111","i-am-a-uuid"]'
 signal_api_endpoint_full_path='https://fully.qualified.domain.name/v2/send'