Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A changelog is a log or record of changes made to a project, such as a website or software project, usually including such records as bug fixes, new features, etc. Most open source projects include a changelog as one of the top level files in their distribution. Although the canonical naming convention for the file is ChangeLog,[1] it is sometimes alternatively named as CHANGES or HISTORY (NEWS is usually a different file reflecting changes between releases, not between the commits). Some project maintainers will append a .txt suffix to the file name. Some revision control systems are able to generate the relevant information that is suited as a changelog.

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