Entire sentence in parentheses

Question

I am formatting a new book for my company and ran into a problem.

There is a sentence that reads:

Before beginning, watch Part I in the DVD series, God & the History of Art. (If available as part of your program.)

That the author wants me to change to:

(Before beginning, watch Part I in the DVD series, God & the History of Art. If available as part of your program.)

This sentence is one line, not part of a paragraph.

Is it right to surround an entire standalone sentence with parentheses?

Answer 1

Yes, provided it's all parenthetical material.

This appears to qualify. However, I'd make it all one sentence and add in the deleted it for clarity:

(Before beginning, watch Part I of the DVD series God & the History of Art, if it is available as part of your program.)