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-rw-r--r--lib/axlsx/drawing/ax_data_source.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/axlsx/drawing/ax_data_source.rb b/lib/axlsx/drawing/ax_data_source.rb
index b8aafc5e..c9d4300f 100644
--- a/lib/axlsx/drawing/ax_data_source.rb
+++ b/lib/axlsx/drawing/ax_data_source.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
module Axlsx
# An axis data source that can contain referenced or literal strings or numbers
# @note only string data types are supported - mainly because we have not implemented a chart type that requires a numerical axis value