describe *f in terms of the double precision version (more of this to come... after dinner).

1 files changed, 11 insertions, 2 deletions

diff --git a/lib/libm/man/erf.3 b/lib/libm/man/erf.3
index 5c60a86a86d..19100381d5a 100644
--- a/lib/libm/man/erf.3
+++ b/lib/libm/man/erf.3
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: erf.3,v 1.8 2000/03/02 00:29:49 todd Exp $
+.\"	$OpenBSD: erf.3,v 1.9 2003/02/27 01:07:43 jason Exp $
 .\" Copyright (c) 1985, 1991 Regents of the University of California.
 .\" All rights reserved.
 .\"
@@ -57,7 +57,12 @@ These functions calculate the error function of
 .Pp
 The
 .Fn erf
-calculates the error function of x; where
+calculates the error function of x, and
+the
+.Fn erff
+function is a single precision version of
+.Fn erf .
+The error function is defined as:
 .Bd -filled -offset indent
 .if n \{\
 erf(x) = 2/sqrt(pi)\(**\|integral from 0 to x of exp(\-t\(**t) dt. \}
@@ -78,6 +83,10 @@ from 1.0.
 This is useful, since for large
 .Fa x
 places disappear.
+The
+.Fn erfcf
+function is a single precision version of
+.Fn erfc .
 .Sh SEE ALSO
 .Xr math 3
 .Sh HISTORY