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-rw-r--r--lib/axlsx/drawing/marker.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/axlsx/drawing/marker.rb b/lib/axlsx/drawing/marker.rb
index a4933c33..0e728fc6 100644
--- a/lib/axlsx/drawing/marker.rb
+++ b/lib/axlsx/drawing/marker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
module Axlsx
# The Marker class defines a point in the worksheet that drawing anchors attach to.
# @note The recommended way to manage markers is Worksheet#add_chart Markers are created for a two cell anchor based on the :start and :end options.