diff --git a/install_arch b/install_arch
index ae92459..0655071 100755
--- a/install_arch
+++ b/install_arch
@@ -5,8 +5,14 @@ function main
     read -P 'Timezone: ' -l timezone
     read -P 'Hostname: ' -l new_host_name
     read -P 'Network interface: ' -l net_interface
-    read -P 'Is your disk encrypted? (y/N) ' -l is_encrypt
     read -P 'Username: ' -l username
+    read -P 'Is your disk encrypted? (y/N) ' -l is_encrypt
+
+    set -l encrypted_uuid ''
+    if test "$is_encrypt" = 'y'; or test "$is_encrypt" = 'Y'
+        read -P 'Encrypted device UUID: ' encrypted_uuid
+    end
+
     read -P 'Boot mode (bios/uefi): ' -l boot_mode
     read -P 'Grub target: ' -l device
 
@@ -28,7 +34,7 @@ function main
 
     create_admin_user $username
 
-    install_grub $boot_mode $device
+    install_grub $boot_mode $device $encrypted_uuid
 
     install_openssh
 end
@@ -116,7 +122,7 @@ function create_admin_user -a username
     gpasswd -a $username sudo
 end
 
-function install_grub -a boot_mode target
+function install_grub -a boot_mode target encrypted_uuid
     log "Installing grub to target $target"
 
     switch $boot_mode
@@ -128,6 +134,10 @@ function install_grub -a boot_mode target
             grub-install --target=x86_64-efi --efi-directory=$target --bootloader-id=GRUB
     end
 
+    if test -n "$encrypted_uuid"
+        sed -i "s/loglevel=3 quiet/loglevel=3 quiet cryptdevice=UUID=$encrypted_uuid:cryptlvm/" /etc/default/grub
+    end
+
     grub-mkconfig -o /boot/grub/grub.cfg
 end