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-rw-r--r--lib/axlsx/workbook/workbook.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/axlsx/workbook/workbook.rb b/lib/axlsx/workbook/workbook.rb
index fe3128c9..f0b926db 100644
--- a/lib/axlsx/workbook/workbook.rb
+++ b/lib/axlsx/workbook/workbook.rb
@@ -20,6 +20,7 @@ require 'axlsx/workbook/worksheet/sheet_protection.rb'
require 'axlsx/workbook/worksheet/worksheet.rb'
require 'axlsx/workbook/shared_strings_table.rb'
require 'axlsx/workbook/worksheet/table.rb'
+require 'axlsx/workbook/worksheet/data_validation.rb'
# The Workbook class is an xlsx workbook that manages worksheets, charts, drawings and styles.
# The following parts of the Office Open XML spreadsheet specification are not implimented in this version.