make/take a note idiom       
C1 记录;记住,记下
to write something down or remember it carefully
  I'll just take a note of your name and address. 我只记一下你的姓名和地址。 
 She made a mental note of the title. 她牢牢地记住了标题。 
 Make a note to call again next week. 一定记得下周再打电话。