diff --git a/pkg/de-p1st-installer/de-p1st-installer.sh b/pkg/de-p1st-installer/de-p1st-installer.sh
index 709d628..0eb848c 100755
--- a/pkg/de-p1st-installer/de-p1st-installer.sh
+++ b/pkg/de-p1st-installer/de-p1st-installer.sh
@@ -277,6 +277,11 @@ ff02::2       ip6-allrouters" >> /mnt/etc/hosts || return $?
 }
 
 function user_and_pwd() {
+  # @pre
+  #   USERNAME
+  #   USER_PWD
+  #   ROOT_PWD (optional)
+
   # -m: create home
   # -U: Create a group with the same name as the user, and add the user to this group.
   arch-chroot /mnt useradd -m -s /usr/bin/zsh -g wheel "${USERNAME}" || return $?
@@ -289,6 +294,11 @@ function user_and_pwd() {
   printf "%s:%s" "root"        "${ROOT_PWD}" | chpasswd --root /mnt || return $?
 }
 
+function gen_initramfs(){
+  # TODO
+  true
+}
+
 function main() {
   # @pre
   #   bash libraries imported
@@ -334,8 +344,10 @@ function main() {
 
   # in: HOSTNAME, FQDN (optional), STATIC_IP (optional), IPV6_CAPABLE (optional)
   config_hostname_and_hosts || return $?
-
+  # in: USERNAME, USER_PWD, ROOT_PWD (optional)
   user_and_pwd || return $?
+
+  gen_initramfs || return $?
 }
 
 main "$@"
diff --git a/pkg/de-p1st-mkinitcpio/.install b/pkg/de-p1st-mkinitcpio/.install
index b754ef5..d8f272c 100644
--- a/pkg/de-p1st-mkinitcpio/.install
+++ b/pkg/de-p1st-mkinitcpio/.install
@@ -1,15 +1,25 @@
+## arg 1:  the new package version
+pre_install() {
+  # Check if system is SSE4.2 capable
+  # lscpu is part of util-linux which is a dependency of mkinitcpio
+  lscpu | grep sse4_2 >/dev/null 2>&1
+}
+
 ## arg 1:  the new package version
 post_install() {
   holo apply
+  mkinitcpio -P
 }
 
 ## arg 1:  the new package version
 ## arg 2:  the old package version
 post_upgrade() {
   holo apply
+  mkinitcpio -P
 }
 
 ## arg 1:  the old package version
 post_remove() {
   holo apply
+  mkinitcpio -P
 }
diff --git a/pkg/de-p1st-mkinitcpio/PKGBUILD b/pkg/de-p1st-mkinitcpio/PKGBUILD
index 2884eda..59d7922 100644
--- a/pkg/de-p1st-mkinitcpio/PKGBUILD
+++ b/pkg/de-p1st-mkinitcpio/PKGBUILD
@@ -2,9 +2,9 @@
 _pkgname=mkinitcpio
 _reponame=arch
 pkgname="de-p1st-$_pkgname"
-pkgver=0.0.1
+pkgver=0.0.2
 pkgrel=1
-pkgdesc="mkinitcpio with lz4 compression"
+pkgdesc="mkinitcpio configuration"
 arch=('any')
 url="https://codeberg.org/privacy1st/${_reponame}"
 license=('MIT')
diff --git a/pkg/de-p1st-mkinitcpio/README.md b/pkg/de-p1st-mkinitcpio/README.md
new file mode 100644
index 0000000..5cf1e8a
--- /dev/null
+++ b/pkg/de-p1st-mkinitcpio/README.md
@@ -0,0 +1,50 @@
+# mkinitcpio.conf
+
+After changing the global configuration,
+one should execute:
+
+```shell
+mkinitcpio -P
+```
+
+## compression
+
+Can be enabled with:
+
+```shell
+COMPRESSION='lz4'
+```
+
+## hooks
+
+Hooks to for
+
+1) resuming
+2) BTRFS
+3) encryption
+4) keymap
+
+```shell
+HOOKS=(base udev resume modconf block keyboard keymap encrypt lvm2 btrfs fsck filesystems)
+```
+
+## crc32c_intel
+
+* Archwiki (Ext4#Enabling_metadata_checksums)[https://wiki.archlinux.org/title/Ext4#Enabling_metadata_checksums]
+  > If the CPU supports SSE 4.2, make sure the crc32c_intel 
+  > kernel module is loaded in order to enable the hardware 
+  > accelerated CRC32C algorithm
+* https://en.wikipedia.org/wiki/SSE4#SSE4.2
+* https://bugzilla.redhat.com/show_bug.cgi?id=1874808
+
+On a SSE4.2 capable system, `crc32c-intel` should be used, not `crc32c-generic`.
+
+Check your CPU (see the `.install` script):
+```shell
+lscpu | grep sse4_2
+```
+
+Can be enabled with:
+```shell
+MODULES=('crc32c-intel')
+```
diff --git a/pkg/de-p1st-mkinitcpio/mkinitcpio.conf.holoscript b/pkg/de-p1st-mkinitcpio/mkinitcpio.conf.holoscript
index 5e064c5..ff26cfb 100644
--- a/pkg/de-p1st-mkinitcpio/mkinitcpio.conf.holoscript
+++ b/pkg/de-p1st-mkinitcpio/mkinitcpio.conf.holoscript
@@ -1,5 +1,25 @@
 #!/bin/sh
 # stdin: default config
 # stdout: modified config
-cat
-echo 'COMPRESSION="lz4"'
+
+# save stdin (content of /etc/mkinitcpio.conf) in variable
+stdin=$(cat)
+
+# MODULES is empty
+echo "$stdin" | grep '^MODULES=()'
+
+# assert HOOKS is as expected
+echo "$stdin" | grep '^HOOKS=(base udev autodetect modconf block filesystems keyboard fsck)'
+
+# assert no COMPRESSION option is enabled yet
+! echo "$stdin" | grep '^COMPRESSION='
+
+# assert lz4 COMPRESSION is uncommented
+echo "$stdin" | grep '^#COMPRESSION="lz4"'
+
+# 1) add to MODULES; 2 replace HOOKS; 3) uncomment lz4 COMPRESSION
+sed '
+  s|^MODULES=(|MODULES=(crc32c-intel |;
+  s|^#COMPRESSION="lz4".*$|COMPRESSION="lz4"|;
+  s|^HOOKS=(.*$|HOOKS=(base udev resume modconf block keyboard keymap encrypt lvm2 btrfs fsck filesystems)|
+  ' <<< "$stdin"