diff --git a/handler.go b/handler.go
index 410334a..43b668a 100644
--- a/handler.go
+++ b/handler.go
@@ -29,7 +29,7 @@ type SubHandler struct {
 	// Returns whether the subscription should be accepted.
 	VerifyChallenge func(h *esb.ResponseHeaders, chal *esb.SubscriptionChallenge) bool
 	OnRevocate      func(h *esb.ResponseHeaders, revocation *esb.RevocationNotification)
-	OnNotification  func(h *esb.ResponseHeaders)
+	OnNotification  func(h *esb.ResponseHeaders, notification *esb.EventNotification)
 
 	// IDTracker used to deduplicate notifications
 	IDTracker               IDTracker
@@ -294,7 +294,7 @@ func (s *SubHandler) handleNotification(
 	}
 	event := notification.Event
 	if s.OnNotification != nil {
-		s.OnNotification(h)
+		s.OnNotification(h, &notification)
 	}
 
 	switch h.SubscriptionType {