From 3e7ce697bfae0beff3d2141e978e2dba1ceb3a42 Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Wed, 12 Dec 2018 17:13:26 -0800
Subject: Stating the obvious

---
 lib/action_mailbox/callbacks.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/action_mailbox/callbacks.rb b/lib/action_mailbox/callbacks.rb
index 5f39faa01e..f1bbd0593d 100644
--- a/lib/action_mailbox/callbacks.rb
+++ b/lib/action_mailbox/callbacks.rb
@@ -1,6 +1,7 @@
 require "active_support/callbacks"
 
 module ActionMailbox
+  # Defines the callbacks related to processing.
   module Callbacks
     extend  ActiveSupport::Concern
     include ActiveSupport::Callbacks
-- 
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