diff --git a/db/03-default-users.sql b/db/03-default-users.sql
index 835f918..501796b 100644
--- a/db/03-default-users.sql
+++ b/db/03-default-users.sql
@@ -19,7 +19,10 @@ VALUES
      '$argon2id$v=19$m=65536,t=4,p=1$YmxWaHpqaHRsU1dmZHFUOA$k8veR56hGcoTsciZGVYv/NuPJSyQ3wgzSTyryW/ynto',
      1);
 
--- Grant admin user superuser ACL (acl_id=1 from the acl seed data)
-INSERT INTO `user_to_acl` (`user_to_acl_user_id`, `user_to_acl_acl_id`) VALUES
+-- Grant admin user superuser ACL (acl_id=1 from the acl seed data).
+-- NOTE: user_to_acl is one of the join tables in the schema that does NOT
+-- follow the tablename_fieldname column convention — its columns are the
+-- plain `user_id` and `acl_id`.
+INSERT INTO `user_to_acl` (`user_id`, `acl_id`) VALUES
     (1, 1),  -- admin → superuser
     (2, 3);  -- testuser → user