help:what does it mean , the 10.8 chapter of the make manual , "If any rule in that list is not a match-anything rule, then remove all nonterminal match-anything rules from the list."

[ambrosehuang ambrose]

Hi:
       I found it self-contradictory , when I read  "If any rule in that list is not a match-anything rule, then
remove all nonterminal match-anything rules from the list." ,the Chapter 10.8 of the make manual .Since there isn't any match-anything rule , how can 
I remove all the nonterminal match-anything rules ? I wonder how you understand these words , give me an example , if you have 
any .
Thank you very much !

                                                                                                                                                                          ambrosehua
                                                                                                                                                                           2006.11.14