Comment, Remark, Annotation
Noun and する verb
ちゅうしゃく
その場合は、注釈を付けてください。
In that case, please add notes.
If your brain can't stop pouring out all the explanations your teacher gives you, you'll need to keep notes. That way when the information pours out of your head, you'll still have your comments and annotations to help you remember the teacher's explanations later.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.