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-rw-r--r--lib/axlsx/drawing/cat_axis_data.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/axlsx/drawing/cat_axis_data.rb b/lib/axlsx/drawing/cat_axis_data.rb
index ced5a305..30df1132 100644
--- a/lib/axlsx/drawing/cat_axis_data.rb
+++ b/lib/axlsx/drawing/cat_axis_data.rb
@@ -11,7 +11,9 @@ module Axlsx
data.each { |i| @list << i } if data.is_a?(SimpleTypedList)
end
-
+ # Serializes the object
+ # @param [String] str
+ # @return [String]
def to_xml_string(str = '')
str << '<c:cat>'
str << '<c:strRef>'