README.md in saxlsx-1.6.0 vs README.md in saxlsx-1.6.1

@@ -30,18 +30,22 @@
 ```
 
 ## Usage
 
 ```ruby
-Saxlsx::Workbook.open filename do |w|
+Saxlsx::Workbook.open filename, auto_format: true do |w|
   w.sheets.each do |s|
     puts s.rows.count
     s.rows.each do |r|
       puts r.inspect
     end
   end
 end
 ```
+
+By default `saxlsx` will try to convert `General` type cells that look like
+numbers to ruby floats or integers. You can disable this feature
+using `auto_format: false`.
 
 ## How fast is it?
 
 ```bash
 $ rake bench