Macaroni Salad

I got this from food.com and it's #63733. It was a nice little change from our typical macaroni salad

1 c. mayo
2 Tbsp vinegar
1 Tbsp mustard
1 tsp sugar
1 tsp salt
1/4 tsp pepper
1/2 lb. macaroni, cooked and drained
1 c. sliced celery
1/2 c. chopped green pepper
1/2 c. chopped red pepper
1/2 c. chopped green onion

Combine dressing ingredients. Stir into remaining ingredients. Cover and chill.