Grammatically Correct: The writer's essential guide to punctuation ...

PUNCTUATION
if you ask me, but that's not the point. The point is that perhaps
children should not be trained to mash potatoes.)
For mashed potatoes: Put 1 large (or 2 small) potatoes in a large
pot of salted water and bring to a boil. ...
-NoRA EPHRON, Heartburn
There is no specific limit to the length of what may be put in
parentheses, but it is inadvisable to set off too long a section, as the
reader may have forgotten what preceded the digression by the time
the closing mark finally appears. If you find yourself setting off
anything longer than a paragraph, you should probably rethink the
structure of your work.
MAKING TEXT EASIER TO FOLLOW
Parentheses aren't always planned in advance: Sometimes their
desirability becomes apparent only after you have looked over a first
draft. If you need to cram dense amounts of information into your
writing, you might find that adding parentheses in certain places
serves to make the main points easier to follow. Consider using them
when you want to work in elements that are important, but not
primary, and you do not want these elements to distract from others
that are more vital.
This strategy is often useful in technical or academic writing,
where many complex and interrelated items of information have to
be presented as concisely as possible. For example:
The "Save As" feature lets you save an existing file to either the main
drive or the extra drive under a new name so that you now have two
copies of the same file.
Many readers would miss the fact that this sentence contains two
discrete pieces of information. Its main message is The "Save As"
feature lets you save an existing file under a new name so that
you now have two copies of the same file. The information about
where this new file can be saved, while useful, is separate and
secondary. Putting it within parentheses would prevent it from distracting
the reader from the main thread.
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