Square brackets/grammar
Square brackets have important usage in academic writing, especially when the writer needs to add information to a quotation. Normally, a quotation must be presented exactly as it was spoken or written. The square bracket allows the writer an opportunity to fix mistakes, add explanatory information, change a quote to fit in a sentence, or add emphasis to a word through bold or italics. Similar to the parentheses, the information in the bracket cannot alter the meaning of the quoted material.