commit bash-20080904 snapshot

doc/bashref.texi

@@ -3748,6 +3748,8 @@ the decimal point.
 This option is only effective if @code{read} is reading input from a
 terminal, pipe, or other special file; it has no effect when reading
 from regular files.
+If @var{timeout} is 0, @code{read} returns success if input is available on
+the specified file descriptor, failure otherwise.
 The exit status is greater than 128 if the timeout is exceeded.
 
 @item -u @var{fd}