diff --git a/check_container_upgrade b/check_container_upgrade
index 1d03415..c65af2f 100755
--- a/check_container_upgrade
+++ b/check_container_upgrade
@@ -134,6 +134,7 @@ declare -A CONTAINER_STATUS_FILE
 declare -A CONTAINER_PID
 declare -A UPTODATE
 declare -A ERRORS
+declare -A UNKNOWNS
 CHECKED_CONTAINERS=( )
 
 debug "List running containers..."
@@ -227,20 +228,23 @@ do
 		UPTODATE+=( ["$container"]=$STATUS )
 	else
 		ERRORS+=( ["$container"]=$STATUS )
+		[ $ex -ge 3 ] && UNKNOWNS+=( "$container" )
 	fi
 	[ $EXIT_CODE -ge $ex ] && continue
 	[ $ex -gt 3 ] && ex=3
 	EXIT_CODE=$ex
 done
 
+NOTFOUNDS=()
 if ! is_empty $ONLY_CONTAINERS
 then
 	for container in ${ONLY_CONTAINERS[@]}
 	do
 		if ! in_array $container ${CHECKED_CONTAINERS[@]}
 		then
-			debug "$container - Not found"
-			ERRORS+=( ["$container"]="Not found" )
+			debug "$container - Container not found"
+			ERRORS+=( ["$container"]="Container not found" )
+			NOTFOUNDS+=( "$container" )
 			EXIT_CODE=3
 		fi
 	done
@@ -250,16 +254,16 @@ debug "Final exit code: $EXIT_CODE"
 
 case $EXIT_CODE in
 	0)
-		echo "OK - All containers are uptodate"
+		echo "OK - All ${#UPTODATE[@]} container(s) are uptodate"
 		;;
 	1)
-		echo "WARNING - some containers need to be updated"
+		echo "WARNING - ${#ERRORS[@]} container(s) need to be updated"
 		;;
 	2)
-		echo "CRITICAL - some containers need to be updated"
+		echo "CRITICAL - ${#ERRORS[@]} container(s) need to be updated"
 		;;
 	*)
-		echo "UNKNOWN - fail to retrieve status of some containers"
+		echo "UNKNOWN - fail to retrieve status of ${#UNKNOWNS[@]} container(s)"
 		;;
 esac
 for container in ${!ERRORS[@]}