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Classical software documentation, as it was conceived and intended decades ago, is not the only reality anymore. Official documentation from authoritative and official sources is being replaced by real-time collaborative platforms and ecosystems that have seen a surge, influenced by changes in society, technology, and best practices. These modern tools influence the way developers document the conception, design, and implementation of software. As a by-product of these shifts, developers are changing their way of communicating about software. Where once official documentation stood as the only truth about a project, we now find a multitude of volatile and heterogeneous documentation sources, forming a complex and ever-changing documentation landscape. Software projects often include a top-level README file with important information, which we leverage to identify their documentation landscape. Starting from ∼12K GitHub repositories, we mine their README files to extract links to additional documentation sources. We present a qualitative analysis, revealing multiple dimensions of the documentation landscape (e.g., content type, source type), highlighting important insights. By analyzing instant messaging application links (e.g., Gitter, Slack, Discord) in the histories of README files, we show how this part of the landscape has grown and evolved in the last decade. Our findings show that modern documentation encompasses communication platforms, which are exploding in popularity. This is not a passing phenomenon: On the contrary, it entails a number of unknowns and socio-technical problems the research community is currently ill-prepared to tackle.