diff --git a/plinth/signals.py b/plinth/signals.py
index 342645544..c064d4351 100644
--- a/plinth/signals.py
+++ b/plinth/signals.py
@@ -5,11 +5,23 @@ Django signals emitted within FreedomBox.
 
 from django.dispatch import Signal
 
+# Arguments: -
 pre_module_loading = Signal()
+
+# Arguments: -
 post_module_loading = Signal()
-post_setup = Signal(providing_args=['module_name'])
-pre_hostname_change = Signal(providing_args=['old_hostname', 'new_hostname'])
-post_hostname_change = Signal(providing_args=['old_hostname', 'new_hostname'])
-domain_added = Signal(
-    providing_args=['domain_type', 'name', 'description', 'services'])
-domain_removed = Signal(providing_args=['domain_type', 'name'])
+
+# Arguments: module_name
+post_setup = Signal()
+
+# Arguments: old_hostname, new_hostname
+pre_hostname_change = Signal()
+
+# Arguments: old_hostname, new_hostname
+post_hostname_change = Signal()
+
+# Arguments: domain_type, name, description, services
+domain_added = Signal()
+
+# Arguments: domain_type, name
+domain_removed = Signal()