Should a "search results" return the number of items found?

Is it recommended to add the number of items found on a search results?
In my opinion it is a useful information that gives a quick idea on what you are going to read.
Could it be omitted?

Answer

The Scent of Search by Tyler Tate includes the following recommendation:

Indicate the number of results. This helps users gage the validity of their search. Numerous results can act as a vote of confidence, while few results may raise a red flag.