for your information

Short definition from Wiktionary

Prepositional phrase

1. 1
   Used to introduce a rebuttal to the interlocutor's previous statement, especially when the statement angered or offended the speaker.
2. 2
   Used as a satiric preface to highlight information that an interlocutor should already know or should be able to surmise.
3. 3
   Used other than figuratively or idiomatically: see for, your, information.