diff --git a/start_test.py b/start_test.py
index 7a9eace..87f58e2 100755
--- a/start_test.py
+++ b/start_test.py
@@ -41,7 +41,7 @@ def get_filter_path(test_dir, target):
 def get_opensmtpd_config(port, filter_exe, maildir_path):
     cfg_content = f"""# OpenSMTPD test configuration
 
-# DKIM filter
+# Sub-addresses
 filter "sake" proc-exec "{filter_exe} --address 'a@example.org:11voiefK5PgCX5F1TTcuoQ==' --address 'b:11voiefK5PgCX5F1TTcuoQ=='"
 
 # Tables