diff --git a/themes/mushroom-square.yaml b/themes/mushroom-square.yaml
index 806b744..518487e 100644
--- a/themes/mushroom-square.yaml
+++ b/themes/mushroom-square.yaml
@@ -1,6 +1,7 @@
 # DO NOT EDIT THIS FILE.
 # This file will be reset with updates.
 # If you want to customize it, copy the content in another folder and file and change the name.
+# https://www.home-assistant.io/integrations/frontend/#defining-themes
 Mushroom Square:
     # Home Assistant override
     ha-card-border-radius: 6px