Add '--export-pdf' example to README

README.md

@@ -6,7 +6,7 @@
 1. Export the MuseScore file to a MIDI file
 2. Run the MIDI file through this program.
 3. Open the resulting SVG in Inkscape
-4. Print the SVG to PDF
+4. Print the SVG to PDF (or `inkscape --export-pdf output.pdf input.svg`)
 5. Open the resulting PDF in LibreOffice Draw
 6. Print to your actual printer - tiling over multiple pages if required.