printf(_(" -d, --debug generate lots of debugging output\n"));
printf(_(" -n, --dry-run do not actually do anything\n"));
printf(_(" -N, --no-sync do not wait for changes to be written safely to disk\n"));
- printf(_(" -o, --output output directory\n"));
+ printf(_(" -o, --output=DIRECTORY output directory\n"));
printf(_(" -T, --tablespace-mapping=OLDDIR=NEWDIR\n"
" relocate tablespace in OLDDIR to NEWDIR\n"));
printf(_(" --clone clone (reflink) instead of copying files\n"));