"Add more config detail": A Taxonomy of Installation Instruction Changes

README files play an important role in providing installation-related instructions to software users and are widely used in open source software systems on platforms such as GitHub. However, these files often suffer from various documentation issues, leading to challenges in comprehension and potential errors in content. Despite their significance, there is a lack of systematic understanding regarding the documentation efforts invested in README files, especially in the context of installation-related instructions, which are crucial for users to start with a software project. To fill the research gap, we conducted a qualitative study, investigating 400 GitHub repositories with 1,163 README commits that focused on updates in installation-related sections. Our research revealed six major categories of changes in the README commits, namely pre-installation instructions, installation instructions, post-installation instructions, help information updates, document presentation, and external resource management. We further provide detailed insights into modification behaviours and offer examples of these updates. Based on our findings, we provide recommendations to practitioners for maintaining their README files, as well as motivations for future research directions. These recommendations and research directions encompass completeness, correctness and up-to-dateness, and information presentation consideration. The proposed research directions span the development of automated documentation tools and empirical studies to enhance comprehension of the needs of documentation users. Furthermore, we provide a comprehensive README template tailored to cover the installation-related sections for document maintainers, serving as a practical starting point for their efforts.