Herbed Potato Soup

Growing up, Paw would make potato soup for me when I was sick.  Well The Pope found this recipe online and has made it for me several times.

2 medium potatoes, peeled and diced
2 cups water
1 large onion, chopped
1/4 cup butter, cubed
1/4 cup all-purpose flour
1 teaspoon salt
1/2 teaspoon dried thyme
1/4 teaspoon dried rosemary, crushed
1/4 teaspoon pepper
1 1/2 cups milk

Place potatoes and water in a large saucepan; cook over medium heat until tender. Meanwhile, in another saucepan, saute onion and butter until tender. Stir in the flour, salt, thyme, rosemary, and pepper. Gradually add milk. Bring to a boil; cook and stir for 2 minutes. Add potatoes with cooking liquid; heat through.