def dbw_to_dbmw(dbw):
    """
    Convert dBW to dBmW.

    Given the power in the decibel scale, this function will evaluate the power
    in the decibel-milli-watts scale.

    Parameters
    ----------
    dbw:        float
                Power in the decibel scale (dBW)
    Return
    ------
    dbmw:       float
                Power in the decibel-milli-watts scale (dBmW)
    """
    return dbw + 30