Do your readers need to know anything more about how he looked on the way down?

Some of these will be mentioned, but the reader need not try to remember them.

A reader need not be satisfied just to read the book.

What your readers need is more like an introduction and quality check.

For these people, the newspapers should be asking what the readers need to know.

The reader needed to use the context to work out which alternative was meant.

Just how far over the rainbow need the reader go to get away from stuff like this?

This description may be all the review some readers need.

Students and general readers simply need to learn both systems, regardless of which they prefer.

Writing differs from speech because the readers need not be present at the time.