diff --git a/README.md b/README.md
index 7530157..00c29d2 100644
--- a/README.md
+++ b/README.md
@@ -139,9 +139,14 @@ OPTIONS
  -g "<pkg> ..."     Ignore packages when building the ISO image
  -I <includedir>    Include directory structure under given path in the ROOTFS
  -S "<service> ..." Enable services in the ISO image
+ -e <shell>         Default shell of the root user (must be absolute path).
+                    Set the live.shell kernel argument to change the default shell of anon.
  -C "<arg> ..."     Add additional kernel command line arguments
+ -P "<platform> ..."
+                    Platforms to enable for aarch64 EFI ISO images (available: pinebookpro, x13s)
  -T <title>         Modify the bootloader title (default: Void Linux)
- -v linux<version>  Install a custom Linux version on ISO image (default: linux metapackage)
+ -v linux<version>  Install a custom Linux version on ISO image (default: linux metapackage).
+                    Also accepts linux metapackages (linux-mainline, linux-lts).
  -K                 Do not remove builddir
  -h                 Show this help and exit
  -V                 Show version and exit
@@ -160,6 +165,7 @@ Supported architectures:
  aarch64, aarch64-musl,
  mipsel, mipsel-musl,
  ppc, ppc-musl, ppc64le, ppc64le-musl, ppc64, ppc64-musl
+ riscv64, riscv64-musl
 
 OPTIONS
  -b <system-pkg>  Set an alternative base-system package (default: base-container-full)
@@ -182,7 +188,7 @@ generated by mkrootfs.sh.
 
 Supported platforms: i686, x86_64, GCP,
                      rpi-armv6l, rpi-armv7l, rpi-aarch64,
-                     pinebookpro, pinephone, rock64
+                     pinebookpro, pinephone, rock64, rockpro64
 
 OPTIONS
  -b <system-pkg>  Set an alternative base-system package (default: base-system)
@@ -212,7 +218,7 @@ OPTIONS
  -b <fstype>    /boot filesystem type (default: vfat)
  -B <bsize>     /boot filesystem size (default: 256MiB)
  -r <fstype>    / filesystem type (default: ext4)
- -s <totalsize> Total image size (default: 2GiB)
+ -s <totalsize> Total image size (default: 768MiB)
  -o <output>    Image filename (default: guessed automatically)
  -x <num>       Number of threads to use for image compression (default: dynamic)
  -h             Show this help and exit