All code elements should have sufficient documentation to understand their purpose, usage, and context. This includes adding explanatory comments for non-obvious constants, documenting private functions for maintainability, ensuring grammatical accuracy in all documentation, and providing necessary context such as prerequisites or limitations. Key areas to address: - Add comments to constants or variables that aren't self-explanatory (e.g., `DWP = "dwp" // Name of the debug package action`) - Document private functions with dev-facing comments explaining their purpose - Review documentation for grammatical accuracy and clarity - Include relevant context like version requirements, prerequisites, or usage limitations Example of complete documentation: ```cpp // Returns the repository name for the current source file. // Requires C++20 support for __builtin_FILE functionality. // Use this from within `cc_test` rules. static std::string CurrentRepository(const std::string& file = __builtin_FILE()); ``` This ensures that future developers can understand and maintain the code without needing to reverse-engineer functionality or guess at requirements.