There are four optional package information files you can include in your package:
Defines previous versions of the package that are compatible with this version.
Indicates other packages with which this package has special relationships.
Defines disk space requirements for the target environment, beyond what is needed by the objects defined in the prototype file. For example, additional space might be needed for files that are dynamically created at installation time.
Defines the text for a copyright message displayed at the time of package installation.
Each package information file should have an entry in the prototype file. See Creating Information Files for more information on creating these files.