diff --git a/distrib/sets/lists/comp/mi b/distrib/sets/lists/comp/mi
index 98fd0c72ea80..eb1894cd8d8f 100644
--- a/distrib/sets/lists/comp/mi
+++ b/distrib/sets/lists/comp/mi
@@ -1,4 +1,4 @@
-#	$NetBSD: mi,v 1.2287 2019/10/01 16:07:14 christos Exp $
+#	$NetBSD: mi,v 1.2288 2019/10/02 08:21:08 rin Exp $
 #
 # Note: don't delete entries from here - mark them as "obsolete" instead.
 ./etc/mtree/set.comp				comp-sys-root
@@ -11718,6 +11718,7 @@
 ./usr/share/man/cat9/rootconf.0			comp-sys-catman		.cat
 ./usr/share/man/cat9/round_page.0		comp-sys-catman		.cat
 ./usr/share/man/cat9/rounddown.0		comp-sys-catman		.cat
+./usr/share/man/cat9/rounddown2.0		comp-sys-catman		.cat
 ./usr/share/man/cat9/roundup.0			comp-sys-catman		.cat
 ./usr/share/man/cat9/roundup2.0			comp-sys-catman		.cat
 ./usr/share/man/cat9/rssadapt.0			comp-sys-catman		.cat
@@ -19623,6 +19624,7 @@
 ./usr/share/man/html9/rootconf.html		comp-sys-htmlman	html
 ./usr/share/man/html9/round_page.html		comp-sys-htmlman	html
 ./usr/share/man/html9/rounddown.html		comp-sys-htmlman	html
+./usr/share/man/html9/rounddown2.html		comp-sys-htmlman	html
 ./usr/share/man/html9/roundup.html		comp-sys-htmlman	html
 ./usr/share/man/html9/roundup2.html		comp-sys-htmlman	html
 ./usr/share/man/html9/rssadapt.html		comp-sys-htmlman	html
@@ -27709,6 +27711,7 @@
 ./usr/share/man/man9/rootconf.9			comp-sys-man		.man
 ./usr/share/man/man9/round_page.9		comp-sys-man		.man
 ./usr/share/man/man9/rounddown.9		comp-sys-man		.man
+./usr/share/man/man9/rounddown2.9		comp-sys-man		.man
 ./usr/share/man/man9/roundup.9			comp-sys-man		.man
 ./usr/share/man/man9/roundup2.9			comp-sys-man		.man
 ./usr/share/man/man9/rssadapt.9			comp-sys-man		.man
diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile
index efe6900d6ade..551dade668ce 100644
--- a/share/man/man9/Makefile
+++ b/share/man/man9/Makefile
@@ -1,4 +1,4 @@
-#       $NetBSD: Makefile,v 1.440 2019/08/28 21:48:14 rmind Exp $
+#       $NetBSD: Makefile,v 1.441 2019/10/02 08:21:08 rin Exp $
 
 #	Makefile for section 9 (kernel function and variable) manual pages.
 
@@ -787,6 +787,7 @@ MLINKS+=rnd.9 rnd_attach_source.9 rnd.9 rnd_detach_source.9 \
 	rnd.9 rnd_add_data.9 rnd.9 rnd_add_uint32.9
 MLINKS+=roundup.9 howmany.9 \
 	roundup.9 rounddown.9 \
+	roundup.9 rounddown2.9 \
 	roundup.9 roundup2.9 \
 	roundup.9 powerof2.9
 MLINKS+=rssadapt.9 ieee80211_rssadapt_choose.9 \
diff --git a/share/man/man9/roundup.9 b/share/man/man9/roundup.9
index 02bc3d88a33e..af1cf4d22a78 100644
--- a/share/man/man9/roundup.9
+++ b/share/man/man9/roundup.9
@@ -1,4 +1,4 @@
-.\" $NetBSD: roundup.9,v 1.8 2011/06/01 11:19:19 jruoho Exp $
+.\" $NetBSD: roundup.9,v 1.9 2019/10/02 08:21:08 rin Exp $
 .\"
 .\" Copyright (c) 2010 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -27,7 +27,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd June 1, 2011
+.Dd October 2, 2019
 .Dt ROUNDUP 9
 .Os
 .Sh NAME
@@ -43,6 +43,8 @@
 .Fn rounddown "x" "size"
 .Ft size
 .Fn roundup2 "x" "size"
+.Ft size
+.Fn rounddown2 "x" "size"
 .Ft int
 .Fn powerof2 "x"
 .Sh DESCRIPTION
@@ -64,7 +66,9 @@ rounding the residual up.
 .Pp
 The
 .Fn roundup2
-macro also rounds up, but with the assumption that
+and
+.Fn rounddown2
+macros also round up and down, respectively, but with the assumption that
 .Fa size
 is a power of two.
 If