diff --git a/lib/libc/gen/isinf.3 b/lib/libc/gen/isinf.3
index 50644882c012..db33e258f090 100644
--- a/lib/libc/gen/isinf.3
+++ b/lib/libc/gen/isinf.3
@@ -1,4 +1,4 @@
-.\"	$NetBSD: isinf.3,v 1.4 1998/02/05 18:47:16 perry Exp $
+.\"	$NetBSD: isinf.3,v 1.5 1998/08/02 04:52:54 mycroft Exp $
 .\"
 .\" Copyright (c) 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -49,7 +49,7 @@
 .Fn isnan double
 .Sh DESCRIPTION
 The
-.Fn isninf
+.Fn isinf
 function
 returns 1 if the number is
 .Dq \\*(If ,