diff --git a/README b/README
index 2a2eac3c..517ddb31 100644
--- a/README
+++ b/README
@@ -12,6 +12,7 @@ LIBNAME=lib64
 DESTDIR=/tmp/openrc-image
 MKPAM=pam
 MKPKGCONFIG=no
+MKRCSYS=prefix
 MKSELINUX=yes
 MKTERMCAP=ncurses
 MKTERMCAP=termcap
@@ -33,6 +34,20 @@ LOCAL_PREFIX should be set when to where user maintained packages are.
 Only set LOCAL_PREFIX if different from PKG_PREFIX.
 PREFIX should be set when OpenRC is not installed to /.
 
+MKRCSYS should be set only if you need to specify a default system
+subtype. The subtype should be set to match the type of environment the
+file is installed into, not the virtualization the environment is
+capable of handling. Here is a list of subtypes and their meanings.
+
+jail	FreeBSD jail
+lxc	Linux container
+openvz	Linux OpenVZ
+prefix	Linux and *BSD prefix system
+uml	UsermodeLinux
+vserver	Linux vserver
+xen0 Linux and NetBSD xen0 Domain
+xenU Linux and NetBSD xenU Domain
+
 If any of the following files exist then we do not overwrite them
 /etc/devd.conf
 /etc/rc
diff --git a/etc/rc.conf.FreeBSD b/etc/rc.conf.FreeBSD
index 800c6cf4..139a8256 100644
--- a/etc/rc.conf.FreeBSD
+++ b/etc/rc.conf.FreeBSD
@@ -8,5 +8,5 @@
 # This should be set to the value representing what environment this file is
 # PRESENTLY in, not what virtualization the environment is capable of.
 # See the OpenRC migration guide for more details.
-rc_sys=""
+rc_sys="@RC_SYS_DEFAULT@"
 
diff --git a/etc/rc.conf.Linux b/etc/rc.conf.Linux
index b110a81f..1400af5f 100644
--- a/etc/rc.conf.Linux
+++ b/etc/rc.conf.Linux
@@ -13,7 +13,7 @@
 # This should be set to the value representing what environment this file is
 # PRESENTLY in, not what virtualization the environment is capable of.
 # See the OpenRC migration guide for more details.
-rc_sys=""
+rc_sys="@RC_SYS_DEFAULT@"
 
 ##############################################################################
 # LINUX SPECIFIC OPTIONS
diff --git a/etc/rc.conf.NetBSD b/etc/rc.conf.NetBSD
index b29000b7..3528a00a 100644
--- a/etc/rc.conf.NetBSD
+++ b/etc/rc.conf.NetBSD
@@ -9,5 +9,5 @@
 # This should be set to the value representing what environment this file is
 # PRESENTLY in, not what virtualization the environment is capable of.
 # See the OpenRC migration guide for more details.
-rc_sys=""
+rc_sys="@RC_SYS_DEFAULT@"
 
diff --git a/mk/scripts.mk b/mk/scripts.mk
index 3517aabf..c45fed18 100644
--- a/mk/scripts.mk
+++ b/mk/scripts.mk
@@ -12,7 +12,7 @@ _PKG_SED:=		$(shell ${_PKG_SED_SH})
 _LCL_SED_SH=		if test "${PREFIX}" = "${LOCAL_PREFIX}"; then echo "-e 's:@LOCAL_PREFIX@::g'"; else echo "-e 's:@LOCAL_PREFIX@:${LOCAL_PREFIX}:g'"; fi
 _LCL_SED:=		$(shell ${_LCL_SED_SH})
 
-SED_REPLACE=		-e 's:@SHELL@:${SH}:g' -e 's:@LIB@:${LIBNAME}:g' -e 's:@SYSCONFDIR@:${SYSCONFDIR}:g' -e 's:@LIBEXECDIR@:${LIBEXECDIR}:g' -e 's:@PREFIX@:${PREFIX}:g' ${_PKG_SED} ${_LCL_SED}
+SED_REPLACE=		-e 's:@SHELL@:${SH}:g' -e 's:@LIB@:${LIBNAME}:g' -e 's:@SYSCONFDIR@:${SYSCONFDIR}:g' -e 's:@LIBEXECDIR@:${LIBEXECDIR}:g' -e 's:@PREFIX@:${PREFIX}:g' -e 's:@RC_SYS_DEFAULT@:${MKRCSYS}:g' ${_PKG_SED} ${_LCL_SED}
 
 # Tweak our shell scripts
 .SUFFIXES:	.sh.in .in