updated readme

README.md

@@ -22,6 +22,14 @@ To run the whole pipeline (Binarization + Segmentation + OCR + PageXML output) r
 ```
 $ paperboat -o output_directory -- image_file.png
 ```
+There are different presets available:
+	- default (for historical documents)
+	- modern (for modern documents)
+
+Set the preset using the -p switch:
+```
+$ paperboat -p modern img1.png
+```
 
 It's possible to specify multiple images files to run at once.