README.md in fast_excel-0.4.0 vs README.md in fast_excel-0.4.1

@@ -53,11 +53,11 @@
 workbook = FastExcel.open # creates tmp file
 # ...
 send_data(workbook.read_string, filename: "table.xlsx") # read tmp file and delete it
 ```
 
-Also can use  `workbook.remove_tmp_file` to delete tmp file manually
+Also can use  `workbook.remove_tmp_folder` to delete tmp file manually
 
 
 **Constant memory mode**: saves each row to disk, good for really big files but can not change previous lines that already saved
 ```ruby
 workbook = FastExcel.open(constant_memory: true)
@@ -116,10 +116,10 @@
 ```
 
 
 ### Data Formatting
 ```ruby
-format = worksheet.add_format(
+format = workbook.add_format(
   bold: true,
   italic: true,
   font_outline: true,
   font_shadow: true,
   text_wrap: true,