diff --git a/tools/tools/nanobsd/embedded/README b/tools/tools/nanobsd/embedded/README
index 7be7978dc4fc..e8b1c8c6506e 100644
--- a/tools/tools/nanobsd/embedded/README
+++ b/tools/tools/nanobsd/embedded/README
@@ -12,3 +12,40 @@ This is a work in progress. Generally, to build this you should
      sudo sh ../nanobsd.sh -c foo.cfg
 but do be careful if things are interrupted. There may still be
 bugs lurking that cause your entire FreeBSD tree to disappear.
+
+Some features:
+
+Image size is minimal, we grow the last partition on first boot to
+fill the media.
+
+Images are both as easy as possible to construct, as well as easy as
+possible to expand.
+
+Config			Short description
+beaglebone.cfg		Create a bootable beaglebone image
+qemu-amd64.cfg		Create a bootable amd64 image for qemu (W)
+qemu-i386.cfg		Create a bootable i386 image for qemu (W)
+qemu-mips.cfg		Create a bootable mips malta board image for
+			qemu
+qemu-mips64.cfg		Create a bootable mips malta board (64-bit
+			mode) image for qemu
+qemu-powerpc.cfg	Create a bootable 32-bit powerpc image for
+			qemu
+qemu-powerpc64.cfg	Create a bootable 64-bit IBM-flavor image for
+			qemu
+qemu-sparc64.cfg	Create a bootable sparc64 image for qemu
+rpi.cfg			Create a bootable image for Raspberry Pi B
+rpi2.cfg		Create a bootable image for Raspberry Pi2
+sam9260ek.cfg		Create a bootable image for an Atmel SAM9260-EK
+			evaluation board (still needs a kenrel loaded
+			into dataflash or NAND, so experimental).
+sam9g20ek.cfg		Create a bootable image for an Atmel SAM9G20-EK
+			evaluation board (still needs a kenrel loaded
+			into dataflash or NAND, so experimental). Also
+			works on many after-market boards that are somewhat
+			compatible with the refernce board.
+
+QEMU command lines for serial console access
+
+i386: qemu-system-i386 -m 512 -hda _.disk.image.qemu-i386.qcow2 -nographic
+amd64: qemu-system-amd64 -m 512 -hda _.disk.image.qemu-amd64.qcow2 -nographic
diff --git a/tools/tools/nanobsd/embedded/qemu-amd64.cfg b/tools/tools/nanobsd/embedded/qemu-amd64.cfg
index 5ca6837f0493..233d7523430d 100644
--- a/tools/tools/nanobsd/embedded/qemu-amd64.cfg
+++ b/tools/tools/nanobsd/embedded/qemu-amd64.cfg
@@ -37,6 +37,7 @@ NANO_KERNEL=GENERIC
 NANO_DRIVE=ada0
 NANO_NAME=qemu-amd64
 
+NANO_DISKIMAGE_FORMAT=qcow2
 export EMBED_OMIT_FAT=t
 
 . common	# Pull in common definitions, keep last
diff --git a/tools/tools/nanobsd/embedded/qemu-mips.cfg b/tools/tools/nanobsd/embedded/qemu-mips.cfg
index 9b9581d80e78..aa17837d540f 100644
--- a/tools/tools/nanobsd/embedded/qemu-mips.cfg
+++ b/tools/tools/nanobsd/embedded/qemu-mips.cfg
@@ -37,6 +37,7 @@ NANO_KERNEL=MALTA
 NANO_DRIVE=ada0
 NANO_NAME=qemu-mips
 
+NANO_DISKIMAGE_FORMAT=qcow2
 export EMBED_OMIT_FAT=t
 
 . common	# Pull in common definitions, keep last
diff --git a/tools/tools/nanobsd/embedded/qemu-mips64.cfg b/tools/tools/nanobsd/embedded/qemu-mips64.cfg
index 9ac22cd348c2..ce2845b22af2 100644
--- a/tools/tools/nanobsd/embedded/qemu-mips64.cfg
+++ b/tools/tools/nanobsd/embedded/qemu-mips64.cfg
@@ -37,6 +37,7 @@ NANO_KERNEL=MALTA64
 NANO_DRIVE=ada0
 NANO_NAME=qemu-mips64
 
+NANO_DISKIMAGE_FORMAT=qcow2
 export EMBED_OMIT_FAT=t
 
 . common	# Pull in common definitions, keep last
diff --git a/tools/tools/nanobsd/embedded/qemu-powerpc.cfg b/tools/tools/nanobsd/embedded/qemu-powerpc.cfg
index 8c588b1170bb..84ba164b65cb 100644
--- a/tools/tools/nanobsd/embedded/qemu-powerpc.cfg
+++ b/tools/tools/nanobsd/embedded/qemu-powerpc.cfg
@@ -38,6 +38,7 @@ NANO_KERNEL=GENERIC
 NANO_DRIVE=ada0
 NANO_NAME=qemu-powerpc
 
+NANO_DISKIMAGE_FORMAT=qcow2
 export EMBED_OMIT_FAT=t
 
 . common	# Pull in common definitions, keep last
diff --git a/tools/tools/nanobsd/embedded/qemu-powerpc64.cfg b/tools/tools/nanobsd/embedded/qemu-powerpc64.cfg
index 1563472946cb..c0e2dcb10197 100644
--- a/tools/tools/nanobsd/embedded/qemu-powerpc64.cfg
+++ b/tools/tools/nanobsd/embedded/qemu-powerpc64.cfg
@@ -37,6 +37,7 @@ NANO_KERNEL=GENERIC64
 NANO_DRIVE=ada0
 NANO_NAME=qemu-powerpc64
 
+NANO_DISKIMAGE_FORMAT=qcow2
 export EMBED_OMIT_FAT=t
 
 . common	# Pull in common definitions, keep last
diff --git a/tools/tools/nanobsd/embedded/qemu-sparc64.cfg b/tools/tools/nanobsd/embedded/qemu-sparc64.cfg
index 656fcef9baeb..6edd7fad8e92 100644
--- a/tools/tools/nanobsd/embedded/qemu-sparc64.cfg
+++ b/tools/tools/nanobsd/embedded/qemu-sparc64.cfg
@@ -37,6 +37,7 @@ NANO_KERNEL=GENERIC
 NANO_DRIVE=ada0
 NANO_NAME=qemu-sparc64
 
+NANO_DISKIMAGE_FORMAT=qcow2
 export EMBED_OMIT_FAT=t
 
 . common	# Pull in common definitions, keep last