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diff --git a/lib/axlsx/drawing/cat_axis.rb b/lib/axlsx/drawing/cat_axis.rb
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+++ b/lib/axlsx/drawing/cat_axis.rb
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+module Axlsx
+  #A CatAxis object defines a chart category axis
+  class CatAxis < Axis
+    # From the docs: This element specifies that this axis is a date or text axis based on the data that is used for the axis labels, not a specific choice.
+    # @return [Boolean]
+    attr_accessor :auto
+
+    # specifies how the perpendicular axis is crossed
+    # must be one of [:ctr, :l, :r]
+    # @return [Symbol]
+    attr_accessor :lblAlgn 
+
+    # The offset of the labels
+    # must be between a string between 0 and 1000
+    # @return [Integer]
+    attr_accessor :lblOffset
+
+    # regex for validating label offset
+    LBL_OFFSET_REGEX = /0*(([0-9])|([1-9][0-9])|([1-9][0-9][0-9])|1000)%/
+
+    # Creates a new CatAxis object
+    # @param [Integer] axId the id of this axis
+    # @param [Integer] crossAx the id of the perpendicular axis
+    # @option options [Symbol] axPos
+    # @option options [Symbol] tickLblPos
+    # @option options [Symbol] crosses
+    # @option options [Boolean] auto
+    # @option options [Symbol] lblAlgn
+    # @option options [Integer] lblOffset    
+    def initialize(axId, crossAx, options={})
+      super(axId, crossAx, options)
+      self.auto = true
+      self.lblAlgn = :ctr
+      self.lblOffset = "100%"
+      options.each do |o|
+        self.send("#{o[0]}=", o[1]) if self.respond_to? "#{o[0]}="
+      end
+    end 
+
+    def auto=(v) Axlsx::validate_boolean(v); @auto = v; end
+    def lblAlgn=(v) RestrictionValidator.validate "#{self.class}.lblAlgn", [:ctr, :l, :r], v; @lblAlgn = v; end
+    def lblOffset=(v) RegexValidator.validate "#{self.class}.lblOffset", LBL_OFFSET_REGEX, v; @lblOffset = v; end
+
+    # Serializes the category axis
+    # @param [Nokogiri::XML::Builder] xml The document builder instance this objects xml will be added to.
+    # @return [String]
+    def to_xml(xml)
+      xml.send('c:catAx') {
+        super(xml)
+        xml.send('c:auto', :val=>@auto)
+        xml.send('c:lblAlgn', :val=>@lblAlgn)
+        xml.send('c:lblOffset', :val=>@lblOffset)                 
+      }
+    end
+  end
+  
+
+end