From fe5b9f6569f312366ada1c963e65b255c071e1b1 Mon Sep 17 00:00:00 2001
From: Noel Peden <noel@peden.biz>
Date: Thu, 4 Apr 2013 13:57:18 -0700
Subject: Documentation for @formula attribute.

---
 lib/axlsx/workbook/worksheet/conditional_formatting_rule.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/axlsx/workbook/worksheet/conditional_formatting_rule.rb b/lib/axlsx/workbook/worksheet/conditional_formatting_rule.rb
index 39b9612b..9db091be 100644
--- a/lib/axlsx/workbook/worksheet/conditional_formatting_rule.rb
+++ b/lib/axlsx/workbook/worksheet/conditional_formatting_rule.rb
@@ -36,6 +36,8 @@ module Axlsx
                             :stopIfTrue, :timePeriod
 
     # Formula
+    # The formula or value to match against (e.g. 5 with an operator of :greaterThan to specify cell_value > 5).
+    # If the operator is :between or :notBetween, use an array to specify [minimum, maximum]
     # @return [String]
     attr_reader :formula
 
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