postscript

postscript
noun
  1. an additional remark at the end of a letter, after the signature and introduced by ‘PS’
    附笔,又及
    he added a postscript: ‘Leaving tomorrow’.
    他加了一个附笔“明日出发”。
    ■an additional statement or action which provides further information on or a sequel to something
    补充说明;后续行动;续篇
    as a postscript to this, Paul did finally marry.
    补充说明一下,保罗最后终于结婚了。
语源
  1. mid 16th cent.: from Latin postscriptum, neuter past participle (used as a noun) of postscribere 'write under, add', from post 'after, later' + scribere 'write'
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