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-rw-r--r--lib/axlsx/drawing/str_data.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/axlsx/drawing/str_data.rb b/lib/axlsx/drawing/str_data.rb
index 5ea8a892..ab1c25ad 100644
--- a/lib/axlsx/drawing/str_data.rb
+++ b/lib/axlsx/drawing/str_data.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
module Axlsx
# This specifies the last string data used for a chart. (e.g. strLit and strCache)
# This class is extended for NumData to include the formatCode attribute required for numLit and numCache