Answer:
If a header showing the purposes of the text were added, the reader would better understand the document.
Explanation:
A header giving a title to the document and showing its objectives would increase the reader's understanding of the document, as it would show the reader what the text seeks to achieve and what will be presented in the document. This allows the reader to increase their interest in the information in the document and allows the document to be read on an efficient and complete basis.