diff --git a/app/controllers/api/v1/letters_controller.rb b/app/controllers/api/v1/letters_controller.rb
index 9590e31..b11e756 100644
--- a/app/controllers/api/v1/letters_controller.rb
+++ b/app/controllers/api/v1/letters_controller.rb
@@ -1,7 +1,7 @@
 module API
   module V1
     class LettersController < ApplicationController
-      before_action :set_letter, only: [:show, :mark_printed]
+      before_action :set_letter, only: [:show, :mark_printed, :mark_mailed]
 
       def show
         authorize @letter