Question about ResQ, what's the optional decoys and required structural model

Hi,
I am trying to run ResQ by perl runResQ.pl, I got help message below, I noticed one mandatory parameter '-model', is this any predicted PDB model? And another optional parameter '-decoydir', is this the package of predicted models? What's the relationship between '-model' and '-decoydir'? If it is, suppose I want to evaluate 20 predicted models, that is saved in folder 'T0759', in this case, should I let '-decoydir' follow with './T0759'? And which model name I should give to parameter '-model'?

Thanks,

ResQ usage:
runResQ.pl arguments
====================
Mandatory arguments:
====================
-pkgdir I-TASSER_Suite_directory (e.g., /home/username/I-TASSER4.3)
-libdir I-TASSER_template_library_directory (e.g., /home/username/ITLIB)
-protname protein_name (e.g., test)
-model name_of_structure_file (e.g., model.pdb)
-datadir data_dir (where the structure file is located)
-java_home JAVA_HOME_path (where the program "bin/java" is located)

===================
Optional arguments:
===================
-runstyle [parallel or serial] run scripts directly (serial, the default value) or submit LOMETS jobs with qsub (parallel)
-decoydir where the related decoy structures (in PDB format) are located