diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -52,6 +52,9 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20230214: groupmember.9 removed
+OLD_FILES+=usr/share/man/man9/groupmember.9.gz
+
 # 20230314: vcount.9 removed
 OLD_FILES+=usr/share/man/man9/count_dev.9.gz
 OLD_FILES+=usr/share/man/man9/vcount.9.gz
diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile
--- a/share/man/man9/Makefile
+++ b/share/man/man9/Makefile
@@ -160,7 +160,6 @@
 	g_geom.9 \
 	g_provider.9 \
 	g_provider_by_name.9 \
-	groupmember.9 \
 	g_wither_geom.9 \
 	gone_in.9 \
 	hardclock.9 \
diff --git a/share/man/man9/groupmember.9 b/share/man/man9/groupmember.9
deleted file mode 100644
--- a/share/man/man9/groupmember.9
+++ /dev/null
@@ -1,60 +0,0 @@
-.\"
-.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice(s), this list of conditions and the following disclaimer as
-.\"    the first lines of this file unmodified other than the possible
-.\"    addition of one or more copyright notices.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice(s), this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
-.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-.\" DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
-.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
-.\" DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd July 9, 2001
-.Dt GROUPMEMBER 9
-.Os
-.Sh NAME
-.Nm groupmember
-.Nd checks group set for a group ID
-.Sh SYNOPSIS
-.In sys/param.h
-.In sys/ucred.h
-.Ft int
-.Fn groupmember "gid_t gid" "struct ucred *cred"
-.Sh DESCRIPTION
-The
-.Fn groupmember
-function checks to see if the given
-.Fa gid
-is in the group set of the credentials.
-.Pp
-Its arguments are:
-.Bl -tag -width ".Fa cred"
-.It Fa gid
-The group ID to check for.
-.It Fa cred
-The credentials to search for the group in.
-.El
-.Sh RETURN VALUES
-If the
-.Fa gid
-is found, 1 is returned; otherwise, 0 is returned.
-.Sh AUTHORS
-This manual page was written by
-.An Chad David Aq Mt davidc@acns.ab.ca .
diff --git a/sys/kern/kern_prot.c b/sys/kern/kern_prot.c
--- a/sys/kern/kern_prot.c
+++ b/sys/kern/kern_prot.c
@@ -1268,7 +1268,7 @@
 }
 
 /*
- * Check if gid is a member of the group set.
+ * Check if gid is a member of cred's group set.
  */
 int
 groupmember(gid_t gid, struct ucred *cred)