diff --git a/check_systemd_service.sh b/check_systemd_service.sh
index 052749e..0c16e67 100755
--- a/check_systemd_service.sh
+++ b/check_systemd_service.sh
@@ -2,7 +2,7 @@
 
 function usage {
   echo "Usage:
-  -u [UNIT name]
+  -u [UNIT name] (required)
   -t Service is triggered by a timer or is a oneshot service. Is allowed to be inactive
   -d A service is allowed to not be enabled"
 }
@@ -37,8 +37,9 @@ shift $((OPTIND -1))
 
 # Check if UNIT name is provided
 if [ -z "$UNIT_NAME" ]; then
-    usage
-    exit -1
+  echo "Missing unit name."
+  usage
+  exit -1
 fi
 
 # Check if the unit is enabled