Subtitles are often used to clarify or expand on the title of a non-fiction book (novels generally do not have subtitles). Titles that involve unfamiliar terms, or that obliquely reference book contents with jargon or a lyrical passage generally benefit from a strong, clear subtitle. Some examples are:
- SEAL Team Six: Memoirs of an Elite Navy SEAL Sniper - The subtitle elaborates on the somewhat unfamiliar terminology in the title
- A Clearing in the Distance: The Biography of Frederick Law Olmstead - The book title is a lovely but not-very-explanatory line taken from the book; the subtitle explains what the book is.
- The Millionaire Next Door: The Surprising Secrets of America's Wealthy - The title is intriguing, but it could be a biography or a memoir or a book about real estate. The subtitle gives the book mass appeal: who wouldn't want to know those secrets?
- Eat, Pray, Love: One Woman's Search for Everything Across Italy, India and Indonesia - Before it was a huge bestseller, Elizabeth Gilbert's book benefited from a strong subtitle.
For more about writing good book titles, check out:
• What makes a good book title?
• Good Book Titles: Step-by-Step
• How to make a book title better: case study for a selling book title
A great title is one of the first marketing tools in the book publishing toolbox. Read about other critical facets of book promotion:
• How a book jacket is developed.
• All about book marketing and publicity.
If you're being published by a traditional publisher, lot of people are involved in decisions of your book title, what the jacket looks like, the book's marketing and publicity and everything else about the book's development and publication. Read about:
• The various departments in a book publisher.
• The editorial process from manuscript to production hand-off.
• The production process from copyediting to finished book or e-book.