Add comment to notes aliases

app/models/note.rb

@@ -18,6 +18,8 @@ class Note < ActiveRecord::Base
 
   cache_markdown_field :note, pipeline: :note, issuable_state_filter_enabled: true
 
+  # Aliases to make application_helper#edited_time_ago_with_tooltip helper work properly with notes.
+  # See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10392/diffs#note_28719102
   alias_attribute :last_edited_at, :updated_at
   alias_attribute :last_edited_by, :updated_by