A written warning or instruction note: brief directions, cautions, or important points often seen in manuals or on product labels.
パソコンの取り扱い説明書の注意書きをよく読んでください。
Please read the warning notes in the computer manual carefully.
製品に小さな注意書きが貼ってあった。
There was a small instruction note attached to the product.
梱包には割れ物の注意書きが書かれている。
The package has a 'fragile' warning note on it.