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let (one) know
To tell or inform one (of or about something). Be sure to let me know if anything changes between now and then. I let the boss know about the development yesterday.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
let someone know (about something)
to tell someone something; to inform someone of something. Please let me know about it soon. Will you be coming to the picnic? Please let me know.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.