diff --git a/cachalot/signals.py b/cachalot/signals.py
index 56892af..268d907 100644
--- a/cachalot/signals.py
+++ b/cachalot/signals.py
@@ -1,4 +1,5 @@
 from django.dispatch import Signal
 
-
-post_invalidation = Signal(providing_args=['db_alias'])
+# sender: name of table invalidated
+# db_alias: name of database that was effected
+post_invalidation = Signal()