diff --git a/service/install_service.sh b/service/install_service.sh
index 1ec6c7e..2789a35 100644
--- a/service/install_service.sh
+++ b/service/install_service.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Tiny script to install BOSWatch-service to use it via systemctl
+# Tiny script to install BOSWatch-service via systemctl
 # Just a few simple steps are required to (un)register your service
 
 if [[ $EUID -ne 0 ]]; then
@@ -13,9 +13,9 @@ read -p"Do you want to install (i) or remove (r) the service? " action
 if [ "$action" == "i" ]; then
 
     # 1 Check whether the right data are in the service-file
-
+    
     read -p"Did you adapt the file boswatch.service (y/n)? " response
-
+    
     if [ "$response" == "y" ]; then
         # 2 Copy the file
         cp boswatch.service /etc/systemd/system
@@ -29,17 +29,23 @@ if [ "$action" == "i" ]; then
 
         # 5 post the status
         systemctl status boswatch.service
-    else
+    elif [ "$response" == "n" ]; then
         echo "Please adapt your personal boswatch.service-file"
         exit 1
+    else
+        echo "Invalid input - please try again"
+        exit 1
     fi
-else # we want to remove the service
+elif [ "$action" == "r" ]; then # we want to remove the service
     # stop it...
     systemctl stop boswatch.service
-
+    
     # disable it
     systemctl disable boswatch.service
 
     # and remove it
     rm /etc/systemd/system/boswatch.service
+else # error handling
+    echo "Invalid input - please try again"
+    exit 1
 fi