def METHOD_NAME(self, filename, ssb_filename_that_is_included):
    """Adds an entry to the inclusion map for filename (can be SSB filename or inclusion map filename)."""
    filename = self._explorerscript_resolve_filename(
        filename, EXPLORERSCRIPT_EXT + EXPLORERSCRIPT_INCLUSION_MAP_SUFFIX
    )
    entries: List[str] = self._explorerscript_get_inclusion_map(filename)
    if ssb_filename_that_is_included not in entries:
        entries.append(ssb_filename_that_is_included)
    self._explorerscript_save_inclusion_map(filename, entries)