"This procedure has a variety of uses: waiting for the ability\n"
"to provide input, accept output, or the existence of\n"
"exceptional conditions on a collection of ports or file\n"
- "descriptors, or waiting for a timeout to occur.\n"
- "It also returns if interrupted by a signal.\n\n"
+ "descriptors, or waiting for a timeout to occur.\n\n"
+
+ "When an error occurs, of if it is interrupted by a signal, this\n"
+ "procedure throws a @code{system-error} exception\n"
+ "(@pxref{Conventions, @code{system-error}}). In case of an\n"
+ "interruption, the associated error number is @var{EINTR}.\n\n"
+
"@var{reads}, @var{writes} and @var{excepts} can be lists or\n"
"vectors, with each member a port or a file descriptor.\n"
"The value returned is a list of three corresponding\n"