diff --git a/share/man/man5/group.5 b/share/man/man5/group.5
--- a/share/man/man5/group.5
+++ b/share/man/man5/group.5
@@ -152,6 +152,7 @@
 .Xr initgroups 3 ,
 .Xr nsswitch.conf 5 ,
 .Xr passwd 5 ,
+.Xr groups 7 ,
 .Xr chkgrp 8 ,
 .Xr pw 8 ,
 .Xr yp 8
diff --git a/share/man/man5/passwd.5 b/share/man/man5/passwd.5
--- a/share/man/man5/passwd.5
+++ b/share/man/man5/passwd.5
@@ -425,6 +425,7 @@
 .Xr login.conf 5 ,
 .Xr netgroup 5 ,
 .Xr nsswitch.conf 5 ,
+.Xr groups 7 ,
 .Xr adduser 8 ,
 .Xr nologin 8 ,
 .Xr pw 8 ,
diff --git a/usr.bin/id/groups.1 b/usr.bin/id/groups.1
--- a/usr.bin/id/groups.1
+++ b/usr.bin/id/groups.1
@@ -59,4 +59,5 @@
 wheel operator
 .Ed
 .Sh SEE ALSO
-.Xr id 1
+.Xr id 1 ,
+.Xr groups 7
diff --git a/usr.bin/id/id.1 b/usr.bin/id/id.1
--- a/usr.bin/id/id.1
+++ b/usr.bin/id/id.1
@@ -180,7 +180,8 @@
 .Ed
 .Sh SEE ALSO
 .Xr groups 1 ,
-.Xr who 1
+.Xr who 1 ,
+.Xr groups 7
 .Sh STANDARDS
 The
 .Nm
diff --git a/usr.bin/newgrp/newgrp.1 b/usr.bin/newgrp/newgrp.1
--- a/usr.bin/newgrp/newgrp.1
+++ b/usr.bin/newgrp/newgrp.1
@@ -76,7 +76,8 @@
 .Xr umask 1 ,
 .Xr group 5 ,
 .Xr passwd 5 ,
-.Xr environ 7
+.Xr environ 7 ,
+.Xr groups 7
 .Sh STANDARDS
 The
 .Nm
diff --git a/usr.sbin/adduser/adduser.8 b/usr.sbin/adduser/adduser.8
--- a/usr.sbin/adduser/adduser.8
+++ b/usr.sbin/adduser/adduser.8
@@ -445,6 +445,7 @@
 .Xr login.conf 5 ,
 .Xr passwd 5 ,
 .Xr shells 5 ,
+.Xr groups 7 ,
 .Xr pw 8 ,
 .Xr pwd_mkdb 8 ,
 .Xr rmuser 8 ,
diff --git a/usr.sbin/chkgrp/chkgrp.8 b/usr.sbin/chkgrp/chkgrp.8
--- a/usr.sbin/chkgrp/chkgrp.8
+++ b/usr.sbin/chkgrp/chkgrp.8
@@ -73,7 +73,8 @@
 scanned and the line number on which the error was found.
 .Sh SEE ALSO
 .Xr getgrent 3 ,
-.Xr group 5
+.Xr group 5 ,
+.Xr groups 7
 .Sh HISTORY
 The
 .Nm
diff --git a/usr.sbin/chown/chgrp.1 b/usr.sbin/chown/chgrp.1
--- a/usr.sbin/chown/chgrp.1
+++ b/usr.sbin/chown/chgrp.1
@@ -148,6 +148,7 @@
 .Xr fts 3 ,
 .Xr group 5 ,
 .Xr passwd 5 ,
+.Xr groups 7 ,
 .Xr symlink 7 ,
 .Xr chown 8
 .Sh STANDARDS
diff --git a/usr.sbin/chown/chown.8 b/usr.sbin/chown/chown.8
--- a/usr.sbin/chown/chown.8
+++ b/usr.sbin/chown/chown.8
@@ -166,6 +166,7 @@
 .Xr find 1 ,
 .Xr chown 2 ,
 .Xr fts 3 ,
+.Xr groups 7 ,
 .Xr symlink 7
 .Sh STANDARDS
 The
diff --git a/usr.sbin/pw/pw.8 b/usr.sbin/pw/pw.8
--- a/usr.sbin/pw/pw.8
+++ b/usr.sbin/pw/pw.8
@@ -1101,6 +1101,7 @@
 .Xr login.conf 5 ,
 .Xr passwd 5 ,
 .Xr pw.conf 5 ,
+.Xr groups 7 ,
 .Xr pwd_mkdb 8 ,
 .Xr vipw 8 ,
 .Xr zfs 8