在洗发包中切一个字

Here, I want the word that denotes a cut in a packet of a shampoo. The cut doesn't necessarily be made by those who purchase such shampoos, but by the manufacturers of a particular company. Such cuts are made in packets of shampoos, so that the people who purchase can easily tear them for the use, without even the need of any scissors.Here, I want the word that denotes a cut in a p