diff --git a/README.md b/README.md
index f335715..1e54df2 100644
--- a/README.md
+++ b/README.md
@@ -13,17 +13,12 @@ jq
 curl
 avahi-daemon
 dbus
-```
-
-**Important**: Don't only install NetworkManager, you need also use it on your system.
-
-## Optional
-
-```
 apparmor-utils
 network-manager
 ```
 
+**Important**: Don't only install NetworkManager, you need also use it on your system.
+
 ## Run
 
 Run as root (sudo su):
diff --git a/hassio_install.sh b/hassio_install.sh
index fbe4e0c..3fabc15 100755
--- a/hassio_install.sh
+++ b/hassio_install.sh
@@ -19,8 +19,8 @@ command -v jq > /dev/null 2>&1 || { echo "[Error] Please install jq first"; exit
 command -v curl > /dev/null 2>&1 || { echo "[Error] Please install curl first"; exit 1; }
 command -v avahi-daemon > /dev/null 2>&1 || { echo "[Error] Please install avahi first"; exit 1; }
 command -v dbus-daemon > /dev/null 2>&1 || { echo "[Error] Please install dbus first"; exit 1; }
-command -v nmcli > /dev/null 2>&1 || echo "[Warning] No NetworkManager support on host."
-command -v apparmor_parser > /dev/null 2>&1 || echo "[Warning] No AppArmor support on host."
+command -v nmcli > /dev/null 2>&1 || { echo "[Error] No NetworkManager support on host."; exit 1; }
+command -v apparmor_parser > /dev/null 2>&1 || { echo "[Error] No AppArmor support on host."; exit 1; }
 
 # Check if Modem Manager is enabled
 if systemctl list-unit-files ModemManager.service | grep enabled; then