capitalization - What words are not capitalized in titles?

For instance:

The Story of a Boy who Likes Pancakes and is Hungry <- (completely random made-up title)

In this example "of, "a", "who", "and", and "is" are all not capitalized. I'm fairly sure this is correct but I'm not 100% positive about "who". In any case, is there some kind of list of what words are not capitalized in titles, or how do you know when not to capitalize specific words?