While searching for agile project examples, I discovered a white paper published by Fergal Mc. Govern, CEO and founder of Visible Thread, who found that IT Directors, Project Managers and Business Analyst Team Leads raised the question about the Project Documentation across a portfolio of projects. Fergal Mc. Govern explicitly describes how to apply agile documentation along with traditional presenting a blend of traditional and agile projects.

Update 2023-September:

• McGovern’s document is no longer available at the previous link.
• Other sources on the subject include: Hoda, Rashina & Noble, James & Marshall, Stuart. (2012). Documentation Strategies on Agile Software Development Projects. International Journal of Agile and Extreme Software Development (IJAESD). 1. 10.1504/IJAESD.2012.048308.