Update README

README.md

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 This respository contains files related to [_The Open Organization Leaders Manual_](https://opensource.com/open-organization/resources/leaders-manual), a community-produced companion to Jim Whitehurst's _The Open Organization_ (Harvard Business Review Press).
 
+## About the book
+
 In this exciting new volume, the community forming around Whitehurst's insights shares advice for leaders wishing to alter their attitudes, change their habits, and build the workplace of the future. _The Open Organization Leaders Manual_ is a handbook for anyone attempting to harness the power of openness to lead teams that are more transparent, agile, collaborative, and mission-driven.
 
 Licensed for sharing and modification under a Creative Commons license, the book collects cutting-edge ideas about the ways open source values are changing the ways we work, manage, and lead.
 
+## Repository contents
+
 In this repository, please find:
 
-- The book's cover (in .jpg, .pdf, and .tif formats)
-- A "binary" copy of the book (in .pdf format)
+- The book's cover (in .jpg and.pdf formats)
+- A "binary" copy of the book (in .pdf and .ePub formats)
 - "Source code" for the book (in .odt format)
 
 Please contact [email protected] with comments, suggestions, and feedback.