diff --git a/README.md b/README.md
index f959661..6459c58 100644
--- a/README.md
+++ b/README.md
@@ -13,13 +13,15 @@ jq
 curl
 avahi-daemon
 dbus
+network-manager
 ```
 
+**Important**: Don't only install NetworkManager, you need also use it on your system.
+
 ## Optional
 
 ```
 apparmor-utils
-network-manager
 ```
 
 ## Run
diff --git a/hassio_install.sh b/hassio_install.sh
index eadef7c..1949560 100755
--- a/hassio_install.sh
+++ b/hassio_install.sh
@@ -20,8 +20,8 @@ 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 "[Error] No NetworkManager support on host."; exit 1; }
 command -v apparmor_parser > /dev/null 2>&1 || echo "[Warning] No AppArmor support on host."
-command -v nmcli > /dev/null 2>&1 || echo "[Warning] No NetworkManager support on host."
 
 #detect if running on snapped docker
 if snap list docker >/dev/null 2>&1; then