How can I make a text box appear in a multiple select question if someone selects "other"

Hi everyone, 

I have a multiple select question with ‘other’ as an option in which text entry is allowed. I would like to make the textbox appear only if someone selects ‘other’. I already found a code for this when using a  single select question, however, the code does not work for multiple select questions. 

Hope someone can help me :)