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-rw-r--r--lib/redmine/export/pdf.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/redmine/export/pdf.rb b/lib/redmine/export/pdf.rb
index ff383d108..28627c2a4 100644
--- a/lib/redmine/export/pdf.rb
+++ b/lib/redmine/export/pdf.rb
@@ -1,4 +1,6 @@
# encoding: utf-8
+# frozen_string_literal: false
+
#
# Redmine - project management software
# Copyright (C) 2006-2017 Jean-Philippe Lang