diff --git a/lib/libc/locale/mbrtowc.3 b/lib/libc/locale/mbrtowc.3
index 943c9bd5f9cd..80f7a597985e 100644
--- a/lib/libc/locale/mbrtowc.3
+++ b/lib/libc/locale/mbrtowc.3
@@ -1,4 +1,4 @@
-.\" $NetBSD: mbrtowc.3,v 1.7 2006/10/14 07:51:01 wiz Exp $
+.\" $NetBSD: mbrtowc.3,v 1.8 2006/10/16 09:10:29 wiz Exp $
 .\"
 .\" Copyright (c)2002 Citrus Project,
 .\" All rights reserved.
@@ -51,7 +51,9 @@ to the wchar_t object pointed to by
 .Fa pwc
 if
 .Fa pwc
-is non-NULL and
+is
+.Pf non- Dv NULL
+and
 .Fa s
 points to a valid character.
 The conversion happens in accordance with, and changes the conversion
diff --git a/lib/libc/locale/mbtowc.3 b/lib/libc/locale/mbtowc.3
index cb4ac477bfde..317fb3344b0d 100644
--- a/lib/libc/locale/mbtowc.3
+++ b/lib/libc/locale/mbtowc.3
@@ -1,4 +1,4 @@
-.\" $NetBSD: mbtowc.3,v 1.7 2006/10/14 07:51:01 wiz Exp $
+.\" $NetBSD: mbtowc.3,v 1.8 2006/10/16 09:10:29 wiz Exp $
 .\"
 .\" Copyright (c)2002 Citrus Project,
 .\" All rights reserved.
@@ -47,7 +47,9 @@ to a wide character, and stores it in the wchar_t object pointed to by
 .Fa pwc
 if
 .Fa pwc
-is non-NULL and
+is
+.Pf non- Dv NULL
+and
 .Fa s
 points to a valid character.
 This function may inspect at most n bytes of the array beginning from