-
-The argument @var{seconds} need not be an integer. If it is a floating
-point number, this function waits for a fractional number of seconds.
-If @var{seconds} is 0, the function accepts whatever output is
-pending but does not wait.
+
+The argument @var{millisec} is semi-obsolete nowadays because
+@var{seconds} can be a floating point number to specify waiting a
+fractional number of seconds. If @var{seconds} is 0, the function
+accepts whatever output is pending but does not wait.