A formal/polite phrase meaning "as you are aware" or "as you know", often used in writing and formal speech.
御承知のとおり、本日中に書類をご提出ください。
As you are aware, please submit the documents by the end of today.
御承知のとおり、当社は環境保護を重要な方針としています。
As you know, our company regards environmental protection as an important policy.
御承知のとおり、この件は機密情報に該当しますのでご注意ください。
As you are aware, this matter is confidential, so please take care.