README.rdoc in check_writer-0.3.0 vs README.rdoc in check_writer-0.3.1

@@ -64,9 +64,14 @@
   pdf = check1.to_prawn
   pdf.start_new_page # this is a prawn method
   pdf = check2.to_prawn(pdf)
   pdf.render # returns the PDF data for a PDF w/ two checks on two pages
 
+== Signatures
+
+Signatures can be included on the checks by setting the +:signature_image_file+ option, which should
+reference a JPG or PNG image. The recommended dimensions for a signature image are 175px x 40px.
+
 == Tests
 
 check_writer uses the appraisal gem to facilitate testing of various versions of prawn. To run the tests using appraisal:
 
     $ rake appraisal