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-rw-r--r--lib/axlsx/drawing/chart.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/axlsx/drawing/chart.rb b/lib/axlsx/drawing/chart.rb
index 0c68ff4b..636c1713 100644
--- a/lib/axlsx/drawing/chart.rb
+++ b/lib/axlsx/drawing/chart.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
module Axlsx
# A Chart is the superclass for specific charts
# @note Worksheet#add_chart is the recommended way to create charts for your worksheets.