Make a mental note of something/to do something - Idioms by The Free Dictionary
make a mental note of something/to do something
make a mental note of something
to remember something. So, you want to be considered for a job. I'll make a mental note of that. Please make a mental note of my telephone number.
make a mental ˈnote of something/to do something make an effort to remember something without writing it down: I must make a mental note to order more wood. ♢ She made a mental note of the car’s registration number.