def usage(prog_name):
msg = "Usage: %s [-v pdfviewer] [-w psviewer] titletoken-1 [titletoken-2] ... [titletoken-n]\n" \
- " Each title token must occur in any position of the filename.\n" \
+ " Each title token must occur in the filename (at an arbitrary position).\n" \
" You might use quotes to enter multi-word tokens"
return msg % prog_name