diff --git a/README.md b/README.md
index b278f0e..ec78a15 100644
--- a/README.md
+++ b/README.md
@@ -2,13 +2,14 @@
 This repository contains some shell scripts to install Arch Linux for the Raspberry Pi on a SD-Card and to backup a SD-Card.
 
 ## Setup
-### Guided
+### SD-Card
+#### Guided
 To install a Linux distribution manually on a SD card type in:
 
 ```bash
   bash ./sd_setup.sh
 ```
-### Piped
+#### Piped
 To pase the configuration to the program use this syntax:
 ```bash
 (
@@ -21,6 +22,18 @@ To pase the configuration to the program use this syntax:
   echo "y"              #Copy wifi configurations to target system
 )| sudo bash ./sd_setup.sh
 ```
+
+### System
+#### Arch
+```bash
+  pacman-key --init
+  pacman-key --populate archlinuxarm
+```
+#### Ubuntu\\Debian
+```bash
+  sudo apt update
+  sudo apt upgrade
+```
 ## Backup
 To backup a SD card type in:
 
diff --git a/sd_setup.sh b/sd_setup.sh
index 012a21d..235fbe3 100644
--- a/sd_setup.sh
+++ b/sd_setup.sh
@@ -247,7 +247,8 @@ if [ -f "$origin_user_rsa_pub" ]
     target_authorized_keys_content=$(cat "$target_authorized_keys")
     echo "$target_authorized_keys contains the following: $target_authorized_keys_content"
     chown -vR 1000 "$target_user_ssh_folder_path"
-    chmod -vR 400 "$target_user_ssh_folder_path"
+    chmod -v 700 "$target_user_ssh_folder_path"
+    chmod -v 600 "$target_authorized_keys"
   else
     echo "The ssh key \"$origin_user_rsa_pub\" can't be copied to \"$target_authorized_keys\" because it doesn't exist."
 fi