diff --git a/app/controllers/registrations_controller.rb b/app/controllers/registrations_controller.rb
index 05fdac1..03e6f7f 100644
--- a/app/controllers/registrations_controller.rb
+++ b/app/controllers/registrations_controller.rb
@@ -163,7 +163,7 @@ def update
         return
       end
     end
-    # ParticipantMailer.registration_changed(@registration).deliver
+    ParticipantMailer.registration_changed(@registration).deliver
     redirect_to tournament_participants_path(@tournament)
   end