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+## Description
+
+You could make validations based on text length
+
+## Code
+
+```ruby
+require 'axlsx'
+
+p = Axlsx::Package.new
+wb = p.workbook
+
+wb.add_worksheet(name: 'Basic Worksheet') do |sheet|
+  sheet.add_row ['First', 'Second', 'Third']
+  sheet.add_row ['Some', 'text', 'to validate']
+
+  sheet.add_data_validation('A2:C2',
+    type: :textLength,
+    operator: :lessThan,
+    formula1: '10',
+    showErrorMessage: true,
+    errorTitle: 'Text is too long',
+    error: 'Max text length is 10 characters',
+    errorStyle: :stop,
+    showInputMessage: true,
+    promptTitle: 'Text length',
+    prompt: 'Max text length is 10 characters')
+end
+
+p.serialize 'text_length_validation_example.xlsx'
+```
+
+## Output
+
+![Output](images/text_length_validation_example.png "Output")