How to change the significant codes default?

I am posting this question on behalf of a Japanese R user
	who wants to know how to change the siginificant codes default.

It's the line
                 symbols = c("***", "**", "*", ".", " "))
in printCoefmat(), isn't it?

(summary.lm makes an object, it doesn't do any printing;
 getAnywhere("print.summary.lm") turns out to call printCoefmat();
 look in printCoefmat and there it is.)