Update README

README.md

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 This respository contains files related to [_The Open Organization Field Guide_](https://opensource.com/open-organization/resources/field-guide), a community-produced companion to Jim Whitehurst's _The Open Organization_ (Harvard Business Review Press).
 
+## About the book
+
 When he published [_The Open Organization_](https://opensource.com/open-organization/) in 2015, Jim Whitehurst invited a community of readers to do more than just read—he asked them to respond.
 
 Less than a year later, they did. _The Open Organization Field Guide: Practical Tips for Igniting Passion and Performance_ is a community-produced companion to Whitehurst's initial thoughts on the future of work, management, and leadership. 
 
 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)
+- 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.