explain weird use of ellipses magic value

archivebox/core/settings.py

@@ -411,7 +411,7 @@ LOGGING = {
 # Add default webhook configuration to the User model
 SIGNAL_WEBHOOKS = {
     "HOOKS": {
-        "django.contrib.auth.models.User": ...,
+        "django.contrib.auth.models.User": ...,  # ... is a special value that means "use the default autogenerated hooks"
         "core.models.Snapshot": ...,
         "core.models.ArchiveResult": ...,
         "core.models.Tag": ...,