This is a text remark, written by MODELLER into PDB files verbatim. You can add multiple remarks by assigning a multi-line Python string to model.remark. It is up to you to add a suitable 'REMARK' prefix to your remark so that it is in valid PDB format.
Note that model.remark is not read in from PDB files by model.read(); it is used only for writing out your own custom remarks.Example: See model.build() command.