Mom's Potato Soup

3 cups potatoes, sliced
1 carrot, sliced
1/2 c celery, diced
1 med onion, chopped
1 tsp salt
1 1/2 cup water
2 cups milk
1 Tbs butter or margarine
1/4 tsp parsley flakes
shredded cheddar cheese
dash of pepper

Cook potatoes, carrots, celery, and onion in water. Boil then simmer until vegetables are tender. Mash vegetables and add milk, butter, parsley flakes, and pepper. Serve warm, sprinkled with cheese.