diff --git a/.config/example.yml b/.config/example.yml
index 8534d3e1ea..ca47c31415 100644
--- a/.config/example.yml
+++ b/.config/example.yml
@@ -8,6 +8,9 @@
 # Final accessible URL seen by a user.
 url: https://example.tld/
 
+# ONCE YOU HAVE STARTED THE INSTANCE, DO NOT CHANGE THE
+# URL SETTINGS AFTER THAT!
+
 #   ┌───────────────────────┐
 #───┘ Port and TLS settings └───────────────────────────────────